Using reboot did more of the same. At this point the Xenial version is 16.04.4 - we have a snapshot from 2019-05-28. unattended-upgrades was at 0.90ubuntu0.9 but salt config management upgrades to 1.1ubuntu1.18.04.7~16.04.3 once the machine has salt installed. We pretty much update a symlink which has two publish dates, 2019-05-28 (old) to 2019-09-04 (new). I'm not sure if that's playing a role but I do know 0.90ubuntu0.9 worked for me last time.
# As root dbus-send --system --print-reply \ --dest=org.freedesktop.login1 /org/freedesktop/login1 \ org.freedesktop.login1.Manager.PowerOff boolean:false dbus-send --system --print-reply \ --dest=org.freedesktop.login1 /org/freedesktop/login1 \ org.freedesktop.login1.Manager.Reboot boolean:false -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1843099 Title: Unattended upgrades does not work on shutdown To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1843099/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs