Ubuntu 16.04 scan with 'Simple Scan'?

Asked by peter b on 2016-12-01

$ uname -a
Linux peter-1604GIGAkaveri 4.4.0-51-generic #72-Ubuntu SMP Thu Nov 24 18:29:54 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ scanimage -L
device `snapscan:libusb:003:002' is a AGFA SNAPSCAN e50 flatbed scanner

$ sudo scanimage -L
[sudo] password for peter:
device `snapscan:libusb:003:002' is a AGFA SNAPSCAN e50 flatbed scanner

$ cat /etc/sane.d/dll.conf
# /etc/sane.d/dll.conf - Configuration file for the SANE dynamic backend loader
...
snapscan
...

$ sane-find-scanner
...
found USB scanner (vendor=0x06bd [AGFA], product=0x208f [ SNAPSCAN e50 ]) at libusb:003:002
...

$ scanimage -V
scanimage (sane-backends) 1.0.25git; backend version 1.0.25

$ lsusb
...
Bus 003 Device 002: ID 06bd:208f AGFA-Gevaert NV SnapScan e50
...

/lib/udev/rules.d/40-libsane.rules
....
# AGFA SnapScan e50
ATTRS{idVendor}=="06bd", ATTRS{idProduct}=="208f", ENV{libsane_matched}="yes"
....

$ lsusb
...
Bus 003 Device 002: ID 06bd:208f AGFA-Gevaert NV SnapScan e50
...

$ sudo find /usr/lib -name 'libsane-dll.so'
[sudo] password for peter:
$ **** NO OUTPUT ****

Any idea what/where the problem may be please?

Question information

Language:
English Edit question
Status:
Solved
For:
Ubuntu Edit question
Assignee:
No assignee Edit question
Solved by:
peter b
Solved:
2016-12-03
Last query:
2016-12-03
Last reply:
2016-12-02
Manfred Hampl (m-hampl) said : #1

What do you expect to get by searching for libsane-dll.so?
As far as I know such file does not exist on Ubuntu systems.
I assume that you need the file libsane-snapscan.so.1 which is provided by the libsane package.

What is the output of the commands
uname -a
lsb_release -crid
dpkg -l | grep sane
ls -l /usr/lib/*/sane/libsane*

peter b (b1pete) said : #2

hello Manfred,
- scanner driver maybe? I was not aware of libsane-snapscan.so.1

output of cmds requested below:

$ uname -a
Linux peter-1604GIGAkaveri 4.4.0-51-generic #72-Ubuntu SMP Thu Nov 24 18:29:54 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -crid
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial

$ dpkg -l | grep sane
ii libcommon-sense-perl 3.74-1build1 amd64 module that implements some sane defaults for Perl programs
ii libsane:amd64 1.0.25+git20150528-1ubuntu2 amd64 API library for scanners
ii libsane-common 1.0.25+git20150528-1ubuntu2 all API library for scanners -- documentation and support files
ii libsane-hpaio:amd64 3.16.3+repack0-1 amd64 HP SANE backend for multi-function peripherals
ii sane-utils 1.0.25+git20150528-1ubuntu2 amd64 API library for scanners -- utilities

$ ls -l /usr/lib/*/sane/libsane*
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-abaton.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-abaton.so.1 -> libsane-abaton.so.1.0.25
-rw-r--r-- 1 root root 55520 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-abaton.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-agfafocus.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-agfafocus.so.1 -> libsane-agfafocus.so.1.0.25
-rw-r--r-- 1 root root 67808 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-agfafocus.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-apple.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-apple.so.1 -> libsane-apple.so.1.0.25
-rw-r--r-- 1 root root 67848 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-apple.so.1.0.25
-rw-r--r-- 1 root root 1041 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-artec_eplus48u.la
lrwxrwxrwx 1 root root 32 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-artec_eplus48u.so.1 -> libsane-artec_eplus48u.so.1.0.25
-rw-r--r-- 1 root root 100440 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-artec_eplus48u.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-artec.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-artec.so.1 -> libsane-artec.so.1.0.25
-rw-r--r-- 1 root root 84192 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-artec.so.1.0.25
-rw-r--r-- 1 root root 971 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-as6e.la
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-as6e.so.1 -> libsane-as6e.so.1.0.25
-rw-r--r-- 1 root root 30632 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-as6e.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-avision.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-avision.so.1 -> libsane-avision.so.1.0.25
-rw-r--r-- 1 root root 185072 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-avision.so.1.0.25
-rw-r--r-- 1 root root 957 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-bh.la
lrwxrwxrwx 1 root root 20 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-bh.so.1 -> libsane-bh.so.1.0.25
-rw-r--r-- 1 root root 89016 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-bh.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon630u.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-canon630u.so.1 -> libsane-canon630u.so.1.0.25
-rw-r--r-- 1 root root 72336 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon630u.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon_dr.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-canon_dr.so.1 -> libsane-canon_dr.so.1.0.25
-rw-r--r-- 1 root root 162016 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon_dr.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon.la
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon_pp.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-canon_pp.so.1 -> libsane-canon_pp.so.1.0.25
-rw-r--r-- 1 root root 59448 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon_pp.so.1.0.25
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-canon.so.1 -> libsane-canon.so.1.0.25
-rw-r--r-- 1 root root 96504 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-canon.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-cardscan.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-cardscan.so.1 -> libsane-cardscan.so.1.0.25
-rw-r--r-- 1 root root 63336 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-cardscan.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan2.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan2.so.1 -> libsane-coolscan2.so.1.0.25
-rw-r--r-- 1 root root 100576 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan2.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan3.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan3.so.1 -> libsane-coolscan3.so.1.0.25
-rw-r--r-- 1 root root 104672 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan3.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan.so.1 -> libsane-coolscan.so.1.0.25
-rw-r--r-- 1 root root 117448 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-coolscan.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dc210.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-dc210.so.1 -> libsane-dc210.so.1.0.25
-rw-r--r-- 1 root root 35416 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dc210.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dc240.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-dc240.so.1 -> libsane-dc240.so.1.0.25
-rw-r--r-- 1 root root 43720 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dc240.so.1.0.25
-rw-r--r-- 1 root root 971 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dc25.la
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-dc25.so.1 -> libsane-dc25.so.1.0.25
-rw-r--r-- 1 root root 43808 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dc25.so.1.0.25
-rw-r--r-- 1 root root 1034 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dell1600n_net.la
lrwxrwxrwx 1 root root 31 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-dell1600n_net.so.1 -> libsane-dell1600n_net.so.1.0.25
-rw-r--r-- 1 root root 38832 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dell1600n_net.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dmc.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-dmc.so.1 -> libsane-dmc.so.1.0.25
-rw-r--r-- 1 root root 55632 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-dmc.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epjitsu.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-epjitsu.so.1 -> libsane-epjitsu.so.1.0.25
-rw-r--r-- 1 root root 106024 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epjitsu.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epson2.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-epson2.so.1 -> libsane-epson2.so.1.0.25
-rw-r--r-- 1 root root 188480 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epson2.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epsonds.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-epsonds.so.1 -> libsane-epsonds.so.1.0.25
-rw-r--r-- 1 root root 108904 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epsonds.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epson.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-epson.so.1 -> libsane-epson.so.1.0.25
-rw-r--r-- 1 root root 131024 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-epson.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-fujitsu.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-fujitsu.so.1 -> libsane-fujitsu.so.1.0.25
-rw-r--r-- 1 root root 198880 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-fujitsu.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1 -> libsane-genesys.so.1.0.25
-rw-r--r-- 1 root root 540000 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-gphoto2.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-gphoto2.so.1 -> libsane-gphoto2.so.1.0.25
-rw-r--r-- 1 root root 43584 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-gphoto2.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-gt68xx.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-gt68xx.so.1 -> libsane-gt68xx.so.1.0.25
-rw-r--r-- 1 root root 166168 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-gt68xx.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp3500.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hp3500.so.1 -> libsane-hp3500.so.1.0.25
-rw-r--r-- 1 root root 80064 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp3500.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp3900.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hp3900.so.1 -> libsane-hp3900.so.1.0.25
-rw-r--r-- 1 root root 427880 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp3900.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp4200.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hp4200.so.1 -> libsane-hp4200.so.1.0.25
-rw-r--r-- 1 root root 71784 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp4200.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp5400.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hp5400.so.1 -> libsane-hp5400.so.1.0.25
-rw-r--r-- 1 root root 67448 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp5400.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp5590.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hp5590.so.1 -> libsane-hp5590.so.1.0.25
-rw-r--r-- 1 root root 83968 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp5590.so.1.0.25
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hpaio.so.1 -> libsane-hpaio.so.1.0.0
-rw-r--r-- 1 root root 165800 Mar 29 2016 /usr/lib/x86_64-linux-gnu/sane/libsane-hpaio.so.1.0.0
-rw-r--r-- 1 root root 957 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp.la
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hpljm1005.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hpljm1005.so.1 -> libsane-hpljm1005.so.1.0.25
-rw-r--r-- 1 root root 59424 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hpljm1005.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hpsj5s.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hpsj5s.so.1 -> libsane-hpsj5s.so.1.0.25
-rw-r--r-- 1 root root 34952 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hpsj5s.so.1.0.25
lrwxrwxrwx 1 root root 20 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hp.so.1 -> libsane-hp.so.1.0.25
-rw-r--r-- 1 root root 192248 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hp.so.1.0.25
-rw-r--r-- 1 root root 971 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hs2p.la
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-hs2p.so.1 -> libsane-hs2p.so.1.0.25
-rw-r--r-- 1 root root 115488 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-hs2p.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-ibm.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-ibm.so.1 -> libsane-ibm.so.1.0.25
-rw-r--r-- 1 root root 59624 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-ibm.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kodakaio.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-kodakaio.so.1 -> libsane-kodakaio.so.1.0.25
-rw-r--r-- 1 root root 120896 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kodakaio.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kodak.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-kodak.so.1 -> libsane-kodak.so.1.0.25
-rw-r--r-- 1 root root 71904 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kodak.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs1025.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs1025.so.1 -> libsane-kvs1025.so.1.0.25
-rw-r--r-- 1 root root 109128 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs1025.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs20xx.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs20xx.so.1 -> libsane-kvs20xx.so.1.0.25
-rw-r--r-- 1 root root 88736 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs20xx.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs40xx.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs40xx.so.1 -> libsane-kvs40xx.so.1.0.25
-rw-r--r-- 1 root root 101600 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-kvs40xx.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-leo.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-leo.so.1 -> libsane-leo.so.1.0.25
-rw-r--r-- 1 root root 63840 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-leo.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-lexmark.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-lexmark.so.1 -> libsane-lexmark.so.1.0.25
-rw-r--r-- 1 root root 100992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-lexmark.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-ma1509.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-ma1509.so.1 -> libsane-ma1509.so.1.0.25
-rw-r--r-- 1 root root 71672 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-ma1509.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-magicolor.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-magicolor.so.1 -> libsane-magicolor.so.1.0.25
-rw-r--r-- 1 root root 100952 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-magicolor.so.1.0.25
-rw-r--r-- 1 root root 1013 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-matsushita.la
lrwxrwxrwx 1 root root 28 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-matsushita.so.1 -> libsane-matsushita.so.1.0.25
-rw-r--r-- 1 root root 68240 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-matsushita.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-microtek2.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-microtek2.so.1 -> libsane-microtek2.so.1.0.25
-rw-r--r-- 1 root root 137440 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-microtek2.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-microtek.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-microtek.so.1 -> libsane-microtek.so.1.0.25
-rw-r--r-- 1 root root 96704 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-microtek.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek.la
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_pp.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_pp.so.1 -> libsane-mustek_pp.so.1.0.25
-rw-r--r-- 1 root root 104920 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_pp.so.1.0.25
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek.so.1 -> libsane-mustek.so.1.0.25
-rw-r--r-- 1 root root 162664 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek.so.1.0.25
-rw-r--r-- 1 root root 1020 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_usb2.la
lrwxrwxrwx 1 root root 29 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_usb2.so.1 -> libsane-mustek_usb2.so.1.0.25
-rw-r--r-- 1 root root 161960 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_usb2.so.1.0.25
-rw-r--r-- 1 root root 1013 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_usb.la
lrwxrwxrwx 1 root root 28 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_usb.so.1 -> libsane-mustek_usb.so.1.0.25
-rw-r--r-- 1 root root 170096 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-mustek_usb.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-nec.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-nec.so.1 -> libsane-nec.so.1.0.25
-rw-r--r-- 1 root root 72056 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-nec.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-net.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-net.so.1 -> libsane-net.so.1.0.25
-rw-r--r-- 1 root root 63328 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-net.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-niash.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-niash.so.1 -> libsane-niash.so.1.0.25
-rw-r--r-- 1 root root 72032 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-niash.so.1.0.25
-rw-r--r-- 1 root root 957 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-p5.la
lrwxrwxrwx 1 root root 20 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-p5.so.1 -> libsane-p5.so.1.0.25
-rw-r--r-- 1 root root 51264 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-p5.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-pie.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-pie.so.1 -> libsane-pie.so.1.0.25
-rw-r--r-- 1 root root 84240 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-pie.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-pixma.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-pixma.so.1 -> libsane-pixma.so.1.0.25
-rw-r--r-- 1 root root 190472 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-pixma.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-plustek.la
-rw-r--r-- 1 root root 1013 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-plustek_pp.la
lrwxrwxrwx 1 root root 28 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-plustek_pp.so.1 -> libsane-plustek_pp.so.1.0.25
-rw-r--r-- 1 root root 186520 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-plustek_pp.so.1.0.25
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-plustek.so.1 -> libsane-plustek.so.1.0.25
-rw-r--r-- 1 root root 231456 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-plustek.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-pnm.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-pnm.so.1 -> libsane-pnm.so.1.0.25
-rw-r--r-- 1 root root 40456 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-pnm.so.1.0.25
-rw-r--r-- 1 root root 971 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-qcam.la
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-qcam.so.1 -> libsane-qcam.so.1.0.25
-rw-r--r-- 1 root root 51216 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-qcam.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-ricoh.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-ricoh.so.1 -> libsane-ricoh.so.1.0.25
-rw-r--r-- 1 root root 55528 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-ricoh.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-rts8891.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-rts8891.so.1 -> libsane-rts8891.so.1.0.25
-rw-r--r-- 1 root root 158208 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-rts8891.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-s9036.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-s9036.so.1 -> libsane-s9036.so.1.0.25
-rw-r--r-- 1 root root 55536 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-s9036.so.1.0.25
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sceptre.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-sceptre.so.1 -> libsane-sceptre.so.1.0.25
-rw-r--r-- 1 root root 63712 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sceptre.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sharp.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-sharp.so.1 -> libsane-sharp.so.1.0.25
-rw-r--r-- 1 root root 84496 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sharp.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sm3600.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-sm3600.so.1 -> libsane-sm3600.so.1.0.25
-rw-r--r-- 1 root root 72176 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sm3600.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sm3840.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-sm3840.so.1 -> libsane-sm3840.so.1.0.25
-rw-r--r-- 1 root root 92080 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sm3840.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-snapscan.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-snapscan.so.1 -> libsane-snapscan.so.1.0.25
-rw-r--r-- 1 root root 213248 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-snapscan.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sp15c.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-sp15c.so.1 -> libsane-sp15c.so.1.0.25
-rw-r--r-- 1 root root 68040 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-sp15c.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-st400.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-st400.so.1 -> libsane-st400.so.1.0.25
-rw-r--r-- 1 root root 55872 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-st400.so.1.0.25
-rw-r--r-- 1 root root 985 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.la
lrwxrwxrwx 1 root root 24 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.so.1 -> libsane-stv680.so.1.0.25
-rw-r--r-- 1 root root 75752 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.so.1.0.25
-rw-r--r-- 1 root root 999 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-tamarack.la
lrwxrwxrwx 1 root root 26 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-tamarack.so.1 -> libsane-tamarack.so.1.0.25
-rw-r--r-- 1 root root 59616 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-tamarack.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-teco1.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-teco1.so.1 -> libsane-teco1.so.1.0.25
-rw-r--r-- 1 root root 63872 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-teco1.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-teco2.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-teco2.so.1 -> libsane-teco2.so.1.0.25
-rw-r--r-- 1 root root 72064 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-teco2.so.1.0.25
-rw-r--r-- 1 root root 978 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-teco3.la
lrwxrwxrwx 1 root root 23 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-teco3.so.1 -> libsane-teco3.so.1.0.25
-rw-r--r-- 1 root root 63872 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-teco3.so.1.0.25
-rw-r--r-- 1 root root 971 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-test.la
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-test.so.1 -> libsane-test.so.1.0.25
-rw-r--r-- 1 root root 72688 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-test.so.1.0.25
-rw-r--r-- 1 root root 964 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-u12.la
lrwxrwxrwx 1 root root 21 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-u12.so.1 -> libsane-u12.so.1.0.25
-rw-r--r-- 1 root root 122512 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-u12.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-umax1220u.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-umax1220u.so.1 -> libsane-umax1220u.so.1.0.25
-rw-r--r-- 1 root root 92688 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-umax1220u.so.1.0.25
-rw-r--r-- 1 root root 971 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-umax.la
-rw-r--r-- 1 root root 992 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-umax_pp.la
lrwxrwxrwx 1 root root 25 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-umax_pp.so.1 -> libsane-umax_pp.so.1.0.25
-rw-r--r-- 1 root root 211976 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-umax_pp.so.1.0.25
lrwxrwxrwx 1 root root 22 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-umax.so.1 -> libsane-umax.so.1.0.25
-rw-r--r-- 1 root root 179808 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-umax.so.1.0.25
-rw-r--r-- 1 root root 1006 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-xerox_mfp.la
lrwxrwxrwx 1 root root 27 Jul 14 00:19 /usr/lib/x86_64-linux-gnu/sane/libsane-xerox_mfp.so.1 -> libsane-xerox_mfp.so.1.0.25
-rw-r--r-- 1 root root 71720 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-xerox_mfp.so.1.0.25

comments re output of cmds requested:

- it appears that libsane-snapscan.so.1 is there
-rw-r--r-- 1 root root 213248 Sep 18 2015 /usr/lib/x86_64-linux-gnu/sane/libsane-snapscan.so.1.0.25

Manfred, I also run
$ sudo sane-find-scanner -v -v
[sudo] password for peter:
This is sane-find-scanner from sane-backends 1.0.25git
.....
searching for USB scanners:
....
trying libusb:
<device descriptor of 0x06bd/0x208f at 003:002 (AGFA SNAPSCAN e50 )>
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 255
bDeviceSubClass 255
bDeviceProtocol 255
bMaxPacketSize0 8
idVendor 0x06BD
idProduct 0x208F
bcdDevice 1.22
iManufacturer 1 (AGFA)
iProduct 2 ( SNAPSCAN e50 )
iSerialNumber 0 ()
bNumConfigurations 1
 <configuration 0>
 bLength 9
 bDescriptorType 2
 wTotalLength 39
 bNumInterfaces 1
 bConfigurationValue 1
 iConfiguration 0 ()
 bmAttributes 64 (Self-powered)
 MaxPower 100 mA
  <interface 0>
   <altsetting 0>
   bLength 9
   bDescriptorType 4
   bInterfaceNumber 0
   bAlternateSetting 0
   bNumEndpoints 3
   bInterfaceClass 255
   bInterfaceSubClass 255
   bInterfaceProtocol 255
   iInterface 0 ()
    <endpoint 0>
    bLength 7
    bDescriptorType 5
    bEndpointAddress 0x81 (in 0x01)
    bmAttributes 2 (bulk)
    wMaxPacketSize 64
    bInterval 0 ms
    bRefresh 0
    bSynchAddress 0
    <endpoint 1>
    bLength 7
    bDescriptorType 5
    bEndpointAddress 0x02 (out 0x02)
    bmAttributes 2 (bulk)
    wMaxPacketSize 8
    bInterval 0 ms
    bRefresh 0
    bSynchAddress 0
    <endpoint 2>
    bLength 7
    bDescriptorType 5
    bEndpointAddress 0x83 (in 0x03)
    bmAttributes 3 (interrupt)
    wMaxPacketSize 8
    bInterval 16 ms
    bRefresh 0
    bSynchAddress 0

<trying to find out which USB chip is used>
    checking for LM983[1,2,3] ...
    this is not a LM983x (bDeviceSubClass = 0xff)
    checking for GT-6801 ...
    this is not a GT-6801 (bcdUSB = 0x100)
    checking for GT-6816 ...
    this is not a GT-6816 (bDeviceClass = 255, bInterfaceClass = 255)
    checking for GLxxx ...
    this is not a GL646 (bDeviceClass = 255, bInterfaceClass = 255)
    this is not a GLxxx (bEndpointAddress = 0x2, bmAttributes = 0x2, wMaxPacketSize = 0x8, bInterval = 0x0)
<Couldn't determine the type of the USB chip (result from sane-backends 1.0.25git)>

found USB scanner (vendor=0x06bd [AGFA], product=0x208f [ SNAPSCAN e50 ]) at libusb:003:002
....
<trying to find out which USB chip is used>
could not claim USB device interface
found USB scanner (vendor=0x2357 [Realtek], product=0x0101 [802.11n NIC]) at libusb:007:002
....
 # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

- seeing the above I ran
$ sudo lsusb
[sudo] password for peter:
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 1307:0165 Transcend Information, Inc. 2GB/4GB/8GB Flash Drive
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0603:8122 Novatek Microelectronics Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 045e:00d1 Microsoft Corp. Optical Mouse with Tilt Wheel
Bus 003 Device 002: ID 06bd:208f AGFA-Gevaert NV SnapScan e50
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 009 Device 002: ID 174c:5106 ASMedia Technology Inc. ASM1051 SATA 3Gb/s bridge
Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 002: ID 2357:0101
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 006 Device 002: ID 152d:0539 JMicron Technology Corp. / JMicron USA Technology Corp. JMS539/567 SuperSpeed SATA II/III 3.0G/6.0G Bridge
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 011 Device 002: ID 0bc2:a313 Seagate RSS LLC
Bus 011 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 010 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

- Manfred, I draw your attention please to:
Bus 007 Device 002: ID 2357:0101
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

vis-a-vis

<trying to find out which USB chip is used>
    checking for LM983[1,2,3] ...
    this is not a LM983x (bDeviceSubClass = 0xff)
    checking for GT-6801 ...
    this is not a GT-6801 (bcdUSB = 0x100)
    checking for GT-6816 ...
    this is not a GT-6816 (bDeviceClass = 255, bInterfaceClass = 255)
    checking for GLxxx ...
    this is not a GL646 (bDeviceClass = 255, bInterfaceClass = 255)
    this is not a GLxxx (bEndpointAddress = 0x2, bmAttributes = 0x2, wMaxPacketSize = 0x8, bInterval = 0x0)
<Couldn't determine the type of the USB chip (result from sane-backends 1.0.25git)>

found USB scanner (vendor=0x06bd [AGFA], product=0x208f [ SNAPSCAN e50 ]) at libusb:003:002
....
<trying to find out which USB chip is used>
could not claim USB device interface
found USB scanner (vendor=0x2357 [Realtek], product=0x0101 [802.11n NIC]) at libusb:007:002
....

- re last line above
yes, there is a device as detected by sudo lsusb at 007:002 but it is NOT a scanner; it is a TP-LINK wifi dongle AC1200 connected to a usb 3.0 port off the GigaByte MBOARD
- the device at 007:002 is not compiled into the kernel, it is compiled using
$ sudo apt-get install git
$ git clone https://github.com/abperiasamy/rtl8812AU_8821AU_linux.git
$ cd rtl8812AU_8821AU_linux/
$ sudo make clean
$ sudo make
$ sudo make install
$ sudo modprobe -a 8812au

and is working flawless.

peter b (b1pete) said : #3

more info re 'TP-LINK wifi dongle AC1200 connected to a usb 3.0 port off the GigaByte MBOARD'

I direct your att'n please to Question# 293988 of 2016-05-20 with current status Expired
I just wanted to check git version

~/Stick_driver$ sudo apt-get install git
[sudo] password for peter:
Reading package lists... Done
Building dependency tree
Reading state information... Done
git is already the newest version (1:2.7.4-0ubuntu1).
The following packages were automatically installed and are no longer required:
  libgconfmm-2.6-1v5 libgraphicsmagick-q16-3 libunique-1.0-0 libva-glx1
  libxine2 libxine2-bin libxine2-doc libxine2-ffmpeg libxine2-misc-plugins
  libxine2-plugins libxine2-x linux-headers-4.4.0-43
  linux-headers-4.4.0-43-generic linux-headers-4.4.0-45
  linux-headers-4.4.0-45-generic linux-image-4.4.0-43-generic
  linux-image-4.4.0-45-generic linux-image-extra-4.4.0-43-generic
  linux-image-extra-4.4.0-45-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 20 not upgraded.

Manfred Hampl (m-hampl) said : #4

Most of the text is normal output of the commands to identify a scanner and does not denote a problem.

What exactly is your question or problem?

peter b (b1pete) said : #5

I tried to scan a document using Simple scan app prior to post ; nothing happened then/the scanner did not respond to scan cmd; that prompted an investigation to determine the cause/reasons.

after post and seeing
...
<trying to find out which USB chip is used>
could not claim USB device interface
found USB scanner (vendor=0x2357 [Realtek], product=0x0101 [802.11n NIC]) at libusb:007:002

I started looking in depth at ....found USB scanner (vendor=0x2357 [Realtek], product=0x0101 [802.11n NIC]) at libusb:007:002... output statement, (note: the NIC is a 802.11ac not n). The TP-LINK device was removed/disconnected, pc restarted and procedure above noted used to re-compile. Restarted pc with TP-LINK connected - wifi device was up and running flawless. Started Simple Scan app and .... it worked with no problems this time; the scanner responded as expected and it scanned ok every page fed.

The investigation took a little time but finalized with a happy/working as it should Simple Scan app. Thanks Manfred, problem solved.