Backend /usr/lib/cups/backend/socket does not exist!Google around for couple of hours and tried many different solutions. Finally I found this thread and that was it. No permission setting on /usr/lib/cups/backend/hp or parent directories was necessary. Only to invoke this command under root:
Backend /usr/lib/cups/backend/hp does not exist!
cupsenable Canon-iR-ADV-C5235-5240Post mortem I realized, that the strange scratches through the printer icon (see the image) were not the error of the graphics driver but notification about CUPS disabled device.
Now I am about to find why the printer manager window freezes when I try to click on printer properties :)
By the way, the folder /usr/lib/cups/backend should have the proper rights:
drwxr-xr-x 2 root root 4096 lis 16 16:06 /usr/lib/cups/backend
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