LaserJet Pro MFP M127fn communication error

Did you install plugin. If not please run "hp-plugin" on terminal and follow the prompts

Yes I certainly did. Please see the pastebin link above.

I have also a Dell laptop, running Mint Xfce 32-bit. I installed the latest hplip on it, plugin included. Same problem, same errors.

I'm trying to do it Gentoo way, and failing as seen below. Obviously the path is not correct. Will try now and patch it the usual way.

>>> Emerging (1 of 1) net-print/hplip-3.16.9::gentoo
 * hplip-3.16.9.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ... [ ok ]
 * hplip-3.16.5-patches-1.tar.xz SHA256 SHA512 WHIRLPOOL size ;-) ... [ ok ]
>>> Unpacking source...
>>> Unpacking hplip-3.16.9.tar.gz to /home/portagetmp/portage/net-print/hplip-3.16.9/work
>>> Unpacking hplip-3.16.5-patches-1.tar.xz to /home/portagetmp/portage/net-print/hplip-3.16.9/work
>>> Source unpacked in /home/portagetmp/portage/net-print/hplip-3.16.9/work
>>> Preparing source in /home/portagetmp/portage/net-print/hplip-3.16.9/work/hplip-3.16.9 ...
 * Applying patches from /home/portagetmp/portage/net-print/hplip-3.16.9/work/patches ...
 * hplip-3.12.6-fast-pp_1.patch ... [ ok ]
 * hplip-3.12.6-fast-pp_2.patch ... [ ok ]
 * hplip-3.14.10-process-events-for-systray.patch ... [ ok ]
 * hplip-3.15.6-distribution.patch ... [ ok ]
 * Applying patches from /etc/portage/patches/net-print/hplip ...
 * ajay.patch ...
The text leading up to this was:
--------------------------
|--- /home/ajay/3.16.9-public_release/hplip-3.16.9/io/hpmud/pml.c 2016-09-19 18:34:16.000000000 +0530
|+++ io/hpmud/pml.c 2016-10-07 11:46:37.731688094 +0530
--------------------------
No file to patch. Skipping patch.
3 out of 3 hunks ignored [ !! ]

OK, what I'm doing wrong. I unpacked the tarball, patched it successfully, cd into hplip-3.16.9, ran make ...

 No targets specified and no makefile found. Stop.

OK, managed to build it with patch, the output is below. Thanks for looking into this!

Oct 7 09:42:08 zeus hp-scan[7197]: hp-scan[7197]: warning: No destinations specified. Adding 'file' destination by default.
Oct 7 09:42:11 zeus hp-scan[7197]: io/hpmud/pml.c 250: Error in snmp_synch_response
Oct 7 09:42:13 zeus hp-scan[7197]: io/hpmud/pml.c 250: Error in snmp_synch_response
Oct 7 09:42:13 zeus hp-scan[7197]: io/hpmud/jd.c 93: unable to read device-id
Oct 7 09:42:13 zeus hp-scan[7197]: scan/sane/soapht.c 478: unable to open device hp:/net/HP_LaserJet_Pro_MFP_M127fn?ip=192.168.2.10
Oct 7 09:42:13 zeus hp-scan[7197]: common/utils.c 220: Invalid Library hanlder pLibHandler = NULL.
Oct 7 09:42:13 zeus hp-scan[7197]: common/utils.c 220: Invalid Library hanlder pLibHandler = NULL.
Oct 7 09:42:13 zeus hp-scan[7197]: common/utils.c 220: Invalid Library hanlder pLibHandler = NULL.
Oct 7 09:42:13 zeus hp-scan[7197]: hp-scan[7197]: error: SANE: Error during device I/O (code=9)

OK, this gave me a hint to look at printer setup. SNMP was disabled. I do not remember knowingly disabling it, and everything worked in Windows virtual machine anyway.
With SNMP set to read-only printing and scanning work.

I'm old school, I used to set jumpers before PnP was invented. Do we really need all this SNMP and Avahi and Zeroconf and whatnot? Oh, never mind, end of rant.