deskjet 1510 scanner not detected

Hello,
I have recently connected a Deskjet 1510 printer/scanner to my Ubuntu 16.04.7 LTS (GNU/Linux 4.4.0-211-generic x86_64)

I installed hplip v3.21.6 and I see the printer in cups and I can print from a remote machine.

The scanner is not being detected though. The output of hp-check is below.

Any help is welcome and appreciated.

Stefano

Saving output in log file: /home/simste/Downloads/hplip-3.21.6/hp-check.log

HP Linux Imaging and Printing System (ver. 3.21.6)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the HPLIP supplied tarball (.tar.gz or
.run) to determine if the proper dependencies are installed to successfully compile HPLIP.
2. Run-time check mode (-r or --run): Use this mode to determine if a distro supplied package (.deb, .rpm, etc) or an
already built HPLIP supplied tarball has the proper dependencies installed to successfully run.
3. Both compile- and run-time check mode (-b or --both) (Default): This mode will check both of the above cases (both
compile- and run-time dependencies).

Check types:
a. EXTERNALDEP - External Dependencies
b. GENERALDEP - General Dependencies (required both at compile and run time)
c. COMPILEDEP - Compile time Dependencies
d. [All are run-time checks]
PYEXT SCANCONF QUEUES PERMISSION

Status Types:
    OK
    MISSING - Missing Dependency or Permission or Plug-in
    INCOMPAT - Incompatible dependency-version or Plugin-version

\
(process:27659): Gtk-WARNING **: Locale not supported by C library.
 Using the fallback 'C' locale.
|
(process:27693): Gdk-WARNING **: locale not supported by C library

(process:27693): Gtk-WARNING **: Locale not supported by C library.
 Using the fallback 'C' locale.

---------------
| SYSTEM INFO |
---------------

 Kernel: 4.4.0-211-generic #243-Ubuntu SMP Thu Apr 29 09:14:13 UTC 2021 GNU/Linux
 Host: simste
 Proc: 4.4.0-211-generic #243-Ubuntu SMP Thu Apr 29 09:14:13 UTC 2021 GNU/Linux
 Distribution: 12 16.04
 Bitness: 64 bit

-----------------------
| HPLIP CONFIGURATION |
-----------------------

HPLIP-Version: HPLIP 3.21.6
HPLIP-Home: /usr/share/hplip
HPLIP-Installation: Auto installation is supported for ubuntu distro 16.04 version

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf. Generated from hplip.conf.in by configure.

[hplip]
version=3.21.6

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/HP
ppdbase=/usr/share/ppd
doc=/usr/share/doc/hplip-3.21.6
html=/usr/share/doc/hplip-3.21.6
icon=/usr/share/applications
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv/hp
bin=/usr/bin
apparmor=/etc/apparmor.d
# Following values are determined at configure time and cannot be changed.
[configure]
network-build=yes
libusb01-build=no
pp-build=no
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=no
foomatic-drv-install=no
foomatic-ppd-install=no
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.21.6
restricted-build=no
ui-toolkit=qt4
qt3=no
qt4=yes
qt5=no
policy-kit=no
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=no
class-driver=no

Current contents of '/var/lib/hp/hplip.state' file:
Plugins are not installed. Could not access file: No such file or directory

Current contents of '~/.hplip/hplip.conf' file:
[settings]
systray_visible = 0
systray_messages = 0

[last_used]
device_uri = "hp:/usb/Deskjet_1510_series?serial=CN42G1D6DG05YR"
printer_name =
working_dir = .

[commands]
scan = /usr/bin/xsane -V %SANE_URI%

[refresh]
rate = 30
enable = false
type = 1

[polling]
enable = false
interval = 5
device_list =

[fax]
voice_phone =
email_address =

[upgrade]
notify_upgrade = false
last_upgraded_time = 1626802684
pending_upgrade_time = 0
latest_available_version = 3.17.10

[installation]
date_time = 07/20/21 19:48:00
version = 3.21.6

 <Package-name> <Package-Desc> <Required/Optional> <Min-Version> <Installed-Version> <Status> <Comment>

--------------
| COMPILEDEP |
--------------

 gcc gcc - GNU Project C and C++ Compiler REQUIRED - 5.4.0 OK -
 make make - GNU make utility to maintain groups of programs REQUIRED 3.0 4.1 OK -
 libtool libtool - Library building support services REQUIRED - 2.4.6 OK -

------------------------
| General Dependencies |
------------------------

 libcrypto libcrypto - OpenSSL cryptographic library REQUIRED - 1.0.2 OK -
 python-xml Python XML libraries REQUIRED - 2.1.0 OK -
 libnetsnmp-devel libnetsnmp-devel - SNMP networking library development files REQUIRED 5.0.9 5.7.3 OK -
 sane-devel SANE - Scanning library development files REQUIRED - 1.0.25 OK -
Traceback (most recent call last):
  File "/usr/bin/hp-check", line 862, in <module>
    num_errors, num_warns = dep.validate(time_flag, is_quiet_mode)
  File "/usr/bin/hp-check", line 368, in validate
    self.core.dependencies[dep])
  File "/usr/bin/hp-check", line 210, in __update_deps_info
    installed_ver = self.core.version_func[deps_info[6]]()
  File "/usr/share/hplip/installer/dcheck.py", line 375, in get_pil_version
    return PIL.__version__
AttributeError: 'module' object has no attribute '__version__'