One more info - after making the journal persistent, this is the end of the journal for the session ending with the hang:
.... Feb 04 16:22:00 harry systemd[1]: Stopped ACPI Events Check. Feb 04 16:22:00 harry systemd[1]: Stopped target Sockets. Feb 04 16:22:00 harry systemd[1]: Closed UUID daemon activation socket. Feb 04 16:22:00 harry systemd[1]: Closed RPCbind Server Activation Socket. Feb 04 16:22:00 harry systemd[1]: Closed Syslog Socket. Feb 04 16:22:00 harry systemd[1]: Closed CUPS Scheduler. Feb 04 16:22:00 harry systemd[1]: Closed Socket activation for snappy daemon. Feb 04 16:22:00 harry systemd[1]: Closed D-Bus System Message Bus Socket. Feb 04 16:22:00 harry systemd[1]: Closed Avahi mDNS/DNS-SD Stack Activation Socket. Feb 04 16:22:00 harry systemd[1]: Closed ACPID Listen Socket. Feb 04 16:22:00 harry systemd[1]: Closed /dev/initctl Compatibility Named Pipe. Feb 04 16:22:00 harry systemd[1]: Stopped target Slices. Feb 04 16:22:00 harry systemd[1]: Received SIGRTMIN+21 from PID 4068 (plymouthd). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1661851 Title: cannot enter rescue or emergency state from running system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1661851/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
