Printing as root does not change anything for CUPS. CUPS always runs its filters and backends as the system user "lp", for security reasons.
I have seen some warnings from the filters in your error_log which look like that perhaps one of the filters does not complete its work and so the subsequent filters get broken or incomplete data. -- Can't print on HP 4000N with Jaunty https://bugs.launchpad.net/bugs/348834 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
