[Bug 1948476] Update Released

[Brian Murray]

The verification of the Stable Release Update for systemd has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1948476

Title:
  [SRU] Allow target units to fail

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Released

Bug description:
  [Impact]

  A systemd regression in focal made it think that target units cannot
  fail, which produced warnings like:

  emergency.target: Requested dependency OnFailure=reboot.target ignored
  (target units cannot fail).

  So the OnFailure settings are ignored for targets (see
  https://github.com/snapcore/core-initrd/issues/33 for details).
  Upstream fixed the issue in v246:
  https://github.com/systemd/systemd/commit/94d1ddbd7cd15b1073757eb5ae0645c83f0b414c

  [Test Plan]

  Test on a UC system and check that the above warnings are not shown
  anymore. Check that when a target service type fails, the OnFailure
  setting is used and the mentioned service is run.

  [Where problems could occur]

  Issues might happen if some target has an OnFailure setting that was
  never run in the past because of this bug, and the behavior is not
  really right because it was never tested. However, OnFailure is not
  used that much on 20.04 in target services:

  /lib/systemd $ find . -name \*.target | xargs grep OnFailure
  /lib/systemd $ 
  /etc/systemd $ find . -name \*.target | xargs grep OnFailure
  /etc/systemd $ 

  I've seen it only in emergency.target for UC20.

  [Other Info]
   
  None

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