please reboot with this kernel boot parameter added:
systemd.log_level=debug
Then let the system boot up, and then perform a shutdown, to reproduce
the problem. Then start the system back up (you can remove the kernel
boot parameter) and capture the previous boot's journal, which should
include the problem reproduction while debug is enabled; you can use the
command:
$ journalctl -k -b -1 > /tmp/lp1905166.log
which will capture the log output from the previous boot.
** Changed in: systemd (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1905166
Title:
systemd-shutdown cannot detach DM
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