Reproducible in Quantal with $ update-manager --dist-upgrade
and indeed /usr/lib/python3/dist-packages/janitor is missing the plugincore subpackage. Probably a packaging bug. Investigating... ** Changed in: update-manager (Ubuntu Quantal) Status: Confirmed => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1013490 Title: update-manager crashed with ImportError in /usr/lib/python3/dist- packages/DistUpgrade/DistUpgradeQuirks.py: No module named plugincore.manager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1013490/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs