Simone simone72@email.it wrote:
Then I fortunately missed how to import PPD from the printing GUI ... Went back to gnome, found the Action-->import PPD in the GUI, added the correct ppd and happily tryied to print, but I got your same error, or better, nothing was coming out. Found that the 2 files (one added by KDE the other by gnome) in /etc/cups/ppd/ where different, so copied and pasted the working one to the other, restarted cups and now it is working.
I'd definitely open a Red Hat Bugzilla report. The GNOME configuration tool is Red Hat's, and they need to know they are not configuring things correctly for the Canon (at least compared to KDE).