Same here. My upgrade from 12.04 to 16.04 was freezed. I rebooted and finished with dpkg --configure -a. Next I launched the upgrade-manager and got that warning message (I also had to do a partial upgrade).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573177 Title: sudo update-manager bug after upgrade on 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1573177/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
