[Bug 1914062] Re: NetworkManager-wait-online.service in 1.28.0-2ubuntu1 fails to start in LXC

[Alfonso Sanchez-Beato]

Just FTR, note that the change in NM upstream was needed so the network-
manager snap was able to correctly detect if udevd is running. We
currently build the snap from the source package + some patches
including this one. But, the long term target is to be able to create
the snap by simply staging the network-manager debs. So, please keep
this in mind and try to put back this change as soon as is feasible
again, so we do not need to remove the change in the deb and then put it
back in the snap.

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Title:
  NetworkManager-wait-online.service in 1.28.0-2ubuntu1 fails to start
  in LXC

Status in lxd package in Ubuntu:
  Won't Fix
Status in network-manager package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  This regresses systemd's autopkgtest because it expects the system in
  the container to reach running state, but the system ends up in
  degraded state due to the service failing.

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-hirsute/hirsute/amd64/s/systemd/20210112_185712_ff570@/log.gz
  ...

  ======================================================================
  FAIL: test_no_failed (__main__.ServicesTest)
  No failed units
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.fFC3Lw/build.xLc/real-tree/debian/tests/boot-and-services", line 68, in test_no_failed
      self.assertEqual(failed, [])
  AssertionError: Lists differ: ['● NetworkManager-wait-online.service loa[42 chars]ine'] != []

  First list contains 1 additional elements.
  First extra element 0:
  '● NetworkManager-wait-online.service loaded failed failed Network Manager Wait Online'

  + []
  - ['● NetworkManager-wait-online.service loaded failed failed Network Manager '
  -  'Wait Online']

  ----------------------------------------------------------------------
  Ran 23 tests in 4.435s
  ...

  Reproducible locally by installing n-m from -proposed, then restarting
  the system in the LXC container.

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