Ran into something similar just now. A bit of internet searching suggested<1><2> that it was due to systemd's internal state getting out of sync, and indeed running "systemctl daemon-reload" made it go away.
<1> https://github.com/NixOS/nixpkgs/issues/2584 <2> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=774153 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1456789 Title: restarting services hangs on systemd-tty-ask-password-agent To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1456789/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs