So apparently you already identified some processes that hang on
shutdown. /usr/share/doc/systemd/README.Debian.gz describes how to find
and debug those.
If you want to keep this open against systemd, please attach
/var/log/syslog right after a reboot, which should still contain most of
the shutdown log from the previous boot (if that isn't sufficient, we'll
need a complete journal for shutdown, after enabling persistent journal
-- but let's get to that when we need it).
** Changed in: systemd (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1528655
Title:
Wily/15.10 - systemd hangs reboot + shutdown for long periods of time
Status in systemd package in Ubuntu:
Incomplete
Bug description:
Yet another horrible bug related to systemd which delays shutdowns by
minutes.
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1374759
surfaces this problem + the bug I'm reporting here is a separate
issue.
Neither reboot or shutdown -r now work sensibly any more. Both rely on
systemd, which appears to be the root of most Ubuntu instabilities
now, reading the many reported systemd bugs.
Both the reboot + shutdown -r now commands should do what the mean.
Shutdown + Reboot now...
Not 150-250 seconds after requested, which appears to be some
arbitrary systemd timeout.
Please fix this problem + update this ticket with some workaround to
get an instant reboot, till fix is available.
Thanks.
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