[Bug 1939537] Autopkgtest regression report (lxc/3.0.3-0ubuntu1~18.04.3)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted lxc (3.0.3-0ubuntu1~18.04.3) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

lxd/3.0.3-0ubuntu1~18.04.2 (i386)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#lxc

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1939537

Title:
  Tests in ubuntu_lxc failed with "ERROR: Couldn't find a matching
  image." on X-hwe and older releases

Status in ubuntu-kernel-tests:
  New
Status in lxc package in Ubuntu:
  Confirmed
Status in lxc source package in Bionic:
  Fix Committed

Bug description:
  [ Impact ]

   * The following tests fail as they try to use inexistent LXC images:
     * lxc-test-apparmor-mount
     * lxc-test-autostart
     * lxc-test-unpriv
     * lxc-test-usernic

   * Having them fixed for the affected series (for example, Bionic)
  will allow us to run the LXC test suite without maintaining local
  changes for these tests.

  [ Test Plan ]

   * Run the affected tests on an affected series (e.g. Bionic).
   * The tests should pass.

  [ Where problems could occur ]

   * The regression risk is very low and the changes only affect the
  tests so the regression scope is minimal.

  [Other info]

  Original bug report:

  Issue found on node onibi 4.15.0-142-generic #146~16.04.1

  With bug 1916087 resolved, the following tests:
    * lxc-test-apparmor-mount
    * lxc-test-autostart
    * lxc-test-unpriv
    * lxc-test-usernic

  Are now failing with:
    ERROR: Couldn't find a matching image.

  This is because with lxc version 2.0.11-0ubuntu1~16.04.3 the default target release is "trusty" or the system release if supported. It will be checked with:
    ubuntu-distro-info --supported

  However Xenial is an ESM series now, it won't use xenial as the target
  release but use trusty instead.

  The attempt to download trusty image will fail with this error.

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