[Bug 1990659] Re: Systemd component broken following update

[Nick Rosbrook]

Please turn on debug-level logging for systemd-resolved by running
`systemctl edit systemd-resolved`, and add the following line to the
[Service] section:

Environment=SYSTEMD_LOG_LEVEL=debug

Then `systemctl daemon-reload && systemctl restart systemd-resolved`.
Once you have some debug-level logs, please attach that to this bug
report.

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

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Title:
  Systemd component broken following update

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  Following update to the latest package today (245.4-4ubuntu3.18) on
  focal, systemd-resolved and systemd-timesyncd (at least) can't start

  Ubuntu 20.04
  x86_64
  kernel 5.4.0-122-generic

  logs:

  Sep 23 10:48:53 systemd[1]: Starting Network Name Resolution...
  Sep 23 10:48:53 systemd[1672342]: systemd-resolved.service: Failed to set up mount namespacing: /run/systemd/unit-root/dev: Invalid argument
  Sep 23 10:48:53 systemd[1672342]: systemd-resolved.service: Failed at step NAMESPACE spawning /lib/systemd/systemd-resolved: Invalid argument
  Sep 23 10:48:53 systemd[1]: systemd-resolved.service: Main process exited, code=exited, status=226/NAMESPACE
  Sep 23 10:48:53 systemd[1]: systemd-resolved.service: Failed with result 'exit-code'.
  Sep 23 10:48:53 systemd[1]: Failed to start Network Name Resolution.
  Sep 23 10:48:53 systemd[1]: systemd-resolved.service: Scheduled restart job, restart counter is at 5.
  Sep 23 10:48:53 systemd[1]: Stopped Network Name Resolution.
  Sep 23 10:48:53 systemd[1]: systemd-resolved.service: Start request repeated too quickly.
  Sep 23 10:48:53 systemd[1]: systemd-resolved.service: Failed with result 'exit-code'.
  Sep 23 10:48:53 systemd[1]: Failed to start Network Name Resolution.

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