According to the error_log it seems that the CUPS backend ("socket" here) only connects to the printer once in a while. Can you try whether the printer works better with the LPD or IPP CUPS backends?
-- Documents silently fail to print 9.04 https://bugs.launchpad.net/bugs/374416 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