AFAIK screen -ls considers a screen session dead at least when the server crashed but the socket is still there.
I wonder if the opposite ("SCREEN" server still there as your ps output shows, but the socket is gone) could be a reason, too, i.e. if the move from /var/run to /run could be the cause. (Just an idea which should be checked. Will test that. :-) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1007658 Title: Screen crashed during do-release-upgrade, won't resume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/screen/+bug/1007658/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs