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[Simon McVittie <1438612@xxxxxxxxxxxxxxxxxx>]

(In reply to Simon McVittie from comment #6)
> Perhaps it would be better to make the stop command exit
> nonzero?

Straw man:

ExecStop=/bin/sh -c "echo Stopping the system dbus-daemon is not
supported. Reboot the system instead.; exit 1"

... which does work, but logs "Unit dbus.service entered failed state"
during shutdown. It seems better to avoid "crying wolf" if possible,
because it can hide real issues.

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https://bugs.launchpad.net/bugs/1438612

Title:
  remote file systems hang on shutdown, D-BUS stops too early

Status in D-Bus:
  Confirmed
Status in dbus package in Ubuntu:
  Fix Released

Bug description:
  (part of bug 1431774). During shutdown, D-Bus stops too early. In
  particular, it stops before NetworkManager and remote-fs.target,  so
  that any network unmount  will cause errors and hang the boot. This
  can be seen with

  $ journalctl -b -1 | egrep 'Stop.*(D-Bus|Network M|Remote F)'
  Mär 30 19:05:19 donald systemd[1]: Stopping D-Bus System Message Bus...
  Mär 30 19:05:19 donald systemd[1]: Stopped D-Bus System Message Bus.
  Mär 30 19:05:19 donald systemd[1]: Stopped target Remote File Systems.
  Mär 30 19:05:19 donald systemd[1]: Stopping Remote File Systems.
  Mär 30 19:05:19 donald systemd[1]: Stopped target Remote File Systems (Pre).
  Mär 30 19:05:19 donald systemd[1]: Stopping Remote File Systems (Pre).
  Mär 30 19:05:19 donald systemd[1]: Stopping Network Manager...
  Mär 30 19:05:42 donald systemd[1]: Stopped Network Manager.
  Mär 30 19:05:42 donald systemd[1]: Stopping D-Bus System Message Bus Socket.

  A quick workaround is to add After=dbus.service to
  /lib/systemd/system/NetworkManager.service's [Unit] section, but this
  should be fixed in a more general fashion.

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