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

[Stéphane Graber]

Making /sys read-only will break very very many things that we have no intention of breaking.
LXD is also completely init system agnostic and we have no idea what the init system in a particular container may be.

** Changed in: lxd (Ubuntu)
       Status: New => Invalid

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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:
  Invalid
Status in network-manager package in Ubuntu:
  New
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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