I have captured the output I found in /var/log/syslog (grepped the simple-scan output).
I have tried different distros (debian stable, testing, unstable, arch, manjaro) and scanning fails over all of them. No matter which scanning software I use it fails.
I have the same exact problem with hplip 3.19 and an mfp m28-m31. hp-check shows everything as ok, scanner is seen, scanning begins and the scanner head/light moves, but process ends with same error. Printing works. I'm on kubuntu 18.04
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Apologies for being a bit grumpy, Daniel; thanks for the explanation and the second log. This log does not show the first two lines that are in your first log, so, to some extent, my suggestion worked.
I really have no solution for you; this is one for the HPLIP developers. They are the only ones with full knowledge of plugin operation. However, I eventually realised I had dealt with the issue regarding your MFP-M28-M31 a couple of times before:
In #1811504 I did suggest an alternative scanning method using scan.py. Maybe it might suit you. If you do try it (it doesn't take a long time and is quite easy), I would appreciate knowing the outcome.
The reading head of the scanner does complete its trip from start to finish however the scan.py script fails right after the reading head starts to read. Hence I do not get the result of the scan and I can not use the script again before I restart my printer.
Thanks again for your valuable inputs, I hope this issue gets fixed with the releases of new versions of hplip ... or I might start looking at the code that fails myself if time allows... I do not have any python expertise but I am a web developer and know my way around programming...
I wanted to try Ubuntu MATE 18.10 that is shipped with HPLIP 3.18.7. That would be the first system with the minimum HPLIP version requirement met by default (>=3.18.4). Unfortunately, 32 bit is not supported anymore by Ubuntu. Not only there is no i386 ISO available, but the system prevents me from upgrading from 18.04 (at least in the GUI, I don't think I tried with the CLI). That might be worth trying by someone with a 64 bit computer.
There was a feature called "webscan" on my now dead HP Photosmart 5524 that allowed me to scan from the printer's embedded web server (EWS). I haven't found a similar feature on my HP LaserJet Pro MFP M28w.
Getting an output from 'avahi-browse -rt _uscan._tcp' indicates that the device
supports the eSCL protocol. The SANE escl backend (driver) should be able to do
scanning. It hasn't. This is likely a bug in the SANE backend. You have been unlucky.
Yes, I understand that and am perplexed that sane-airscan is not
working when you have ippusbxd running. ippusbxd basically turns
the m28a into a network scanner and sane-airscan now work with it.
If you removed ippusbxd from the system (it is easily put back) then
surely the hpaio device (with a plugin) should work? I do not know
what will happen with printing should you remove ippusbxd.
Now the fun stuff. I ran the hp-check -r run. The summary at the bottom says there are 12 errors and 1 warning. I have pulled out the errors for you to see. If you want, I can post the entire log of what I got, but I thought maybe start with this first and hopefully the solution becomes clear more quickly? Again, I am new at this OS, but I know long logs can sometimes be problematic to read.
The 12 errors are
Hi, I need to purchase a multifunction printer and the HP LaserJet Pro M28W seems interesting. Since my Linux distribution (Ubuntu 14.04 LTS) comes with the HPLIP software version 3.14.3-0ubuntu3.5 already installed, I wonder if the printer...
Okay, unfortunately still not coaxing the scanner to work. I did double-check to see if the printer component still works. It printed just fine, no problem. So, whatever is going on, it seems to be isolated to the scanner component of this machine.
In regard to VueScan, it did not find the printer / scanner unit either. I searched the supported units and it was not listed. Too bad, honestly, because I looked at it early on and it looks like a nice software package. Not giving up on it (yet), might find a way to adapt it at some point once this problem is solved (or use the list of supported printers as another data point in purchasing a new printer and/scanner one when the time comes).
As for the link regarding supported machines, I searched and confirmed it is not there. Nevertheless, I did bookmark that link for future reference and data points for new printers / scanners. Thank you for providing it.
So, another question comes to mind. How can I find out what hplip version I have on this machine? I would presume it is updated to the latest model, but with this situation, I am not taking anything for granted at this point.
warning: zorin distro is not found in AUTH_TYPES warning: unknown-16 version is not supported. Using unknown-0 versions
Is AUTH_TYPES some sort of authorization I need to set on the computer for it to talk?
This is a message from hp-plugin, when it tries to access scanning using Root Privileges.
Software installed by the user as root will get installed to /usr/share directory.
So, checking /usr/share/hplip/base we find a file password.py we find this list:
Hi, Sorry you are not having much success. I've always preferred Canon inkjet All-in-ones. My current one is a Pixma TS-8151 and works with Document Scanner with Zorin 16 out of the box and absolutely no issues with VueScan. Canon Laser all in ones if that is your preference have dedicated Linux drivers. At work I even got a Kyocera big MFD connected to a notebook running Zorin 15 (which also had dedicated Linux drivers). From what I have read elsewhere, HP seems to be dropping support for Linux in general.
Okay, so perhaps it is the lack of an authorization? If so, How do I add Zorin to the list to see if it is a root-lever permission matter? I suspect I will need to do this under root administrative authority, but I do not know how to do that.
Your FilesNautilus file manager will now be running with admin privileges.
You can also add the ability to do this in GUI using the Right Click > Open as administrator.
Install the Nautilus-Dmin package:
To get to Root in Nautilus:
In the left pane, select "Other locations". Then, in the right pane, select "Computer".
Now you will be at the Base of the Root File Tree. Double click the /usr folder, then the /share folder. Scroll down to the /hplip folder and open it. Then, finally, the folder named base.
Right click the password.py file in that folder. Select open with text editor.
Add 'zorin': 'sudo', at the bottom. It should look like: 152ee80cbc
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