Ubuntu – Upgrade to Ubuntu 18.04 causes network printer (HP OfficeJet Pro 8710) to stop working

I was having the same issue after upgrading to 18.04 and was finally able to resolve it. It seems to be related to an error between adding a printer directly through CUPS vs. using the add printer device option. I also noticed the CUPS errors when attempting to add the printer generically through settings, and after researching CUPS errors here is what I did that resolved the issue:

1) Removed the printer through the interface

2) Shut down the printer completely and re-connected it to the WIFI network.

3) Added the printer back selecting the driverless option through the Add Printer interface

(Note: steps 1-3 may not be completely necessary, but I did them anyway in the interest documenting a path to resolution)

4) From there, I accessed CUPS through: http://localhost:631/admin

(Note: after logging in I noticed the same thing that you did - that the printer wasn't listed at all)

5) From here I proceeded to Add a new printer directly through the CUPS admin page

The printer showed up (Cannon MX922) and I selected to add it using the Default settings.

After that, the printer then showed up through the Device settings (as well as in CUPS), and I also noticed that it not only shows as Ready, but I also have the ink levels showing as well. I then successfully printed a test page and things appear to be working normally (I tried to upload a screen shot for the link below as verification).

Screenshot from Printer listings

From here, I intend to add printers directly through the CUPS admin page vs. the Device settings, as this seems to be the root of the issue.

Hope this helps.

From accepted answer which author will hopefully post here:

I encountered the same problem. To track back its origin I looked into "/var/log/cups/error_log" In my case, I discovered that the problem was caused by icc profiles used by ghostscript. I had the following error:

Started filter pstops (PID 26489)
./base/gsicc_manage.c:1244: gsicc_open_search(): Could not find default_gray.icc
./base/gsicc_manage.c:2261: gsicc_init_iccmanager(): cannot find default icc profile
./base/gsicc_manage.c:1244: gsicc_open_search(): Could not find default_rgb.icc
./base/gsicc_manage.c:2025: gsicc_set_device_profile(): cannot find device profile
**** Unable to open the initial device, quitting.

So what worked out for me has been to manually remove the icc profiles and then re-install libgs9-common (following Broken ghostscript configuration) :

sudo rmdir /usr/share/ghostscript/9.25/iccprofiles
sudo apt-get install --reinstall libgs9-common

Hope this helps