I was seeing this as well, and discovered that the cause was a stale update-manager instance from a month ago was still running. Killing that process resulted in the symptom going away and update-manager works properly now.
robert 17292 0.0 0.1 732572 12432 ? SNl May25 0:44 /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1297132 Title: If launched during update, window is just a title bar To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1297132/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
