Hey Jane! /usr/share/doc/systemd/README.Debian.gz describes some general
steps to get some information about this. Particularly, please run

    systemctl start debug-shell

in a terminal, then shut down. When it's hanging, press Ctrl+Alt+F9,
there should be a root shell running. What does "systemctl list-jobs"
say? There's presumably one job which is stuck at "stopping", which one
is it? At this point, please try if this still works:

   journalctl -b > /var/tmp/journal.txt

(it might already fail depending on how far Ubuntu has been shut down
already). If so, at the next reboot you should have a
/var/tmp/journal.txt, can you please attach this here?

Thanks!

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1591274

Title:
  xenial shutdown takes a looong time

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