I see as the only problem here that jobs are submitted with PageSize=Custom.Letter.SM (and not PageSize=Letter.SM). This is most probably a problem of the GTK print dialog.
** Changed in: cups-filters (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763520 Title: after upgrade to bionic, printing fails without explanation / logs / debuggability To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups-filters/+bug/1763520/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs