Unfortunately, your error_log files do not contain the relevant information as for your CUPS the CUPS-internal default log rotating seems to be active. This restricts logs to a size of 1 MB discarding the needed information within minutes. Your logs cover only ~30 min.
So run cupsctl MaxLogSize=0 and do all your tests again. Note that MaxLogSize=0 is a Ubuntu default which we introduced as we did not get useful error_log files on bug reports. Ubuntu uses the central logrotate facility which restarts logging once in 24 hours and archives the logs of the last 7 days. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/997040 Title: usb printer backend crashes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/997040/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs