[Bug 1873545] Autopkgtest regression report (ubuntu-release-upgrader/1:20.04.20)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted ubuntu-release-upgrader (1:20.04.20) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

update-manager/1:20.04.10.1 (armhf)
update-motd/3.6-0ubuntu6 (armhf, s390x, amd64, arm64, ppc64el)


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/focal/update_excuses.html#ubuntu-release-upgrader

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

Thank you!

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https://bugs.launchpad.net/bugs/1873545

Title:
  Permission denied error from show-motd when updates available

Status in Release Upgrader:
  Fix Released
Status in Ubuntu WSL:
  Fix Released
Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Focal:
  Fix Committed
Status in ubuntu-release-upgrader source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * This impacts focal (20.04 LTS) users on WSL. On WSL version of
  Ubuntu 20.04, on the first time of the launch in a day, the MOTD will
  show. This error will show if apt gets update but packages are not
  upgrade.

  [Test Case]

  * Install Ubuntu/Ubuntu 20.04 LTS from Microsoft Store and setup a
  user.

  * `sudo apt update` and remove `~/.motd_shown`, quit and terminate the
  running distribution by `wsl.exe -t <distro>`.

  * Restart the distribution, the MOTD will be shown again, and the
  error should be gone.

  [Regression Potential]

   * None for now. The file being called in WSL right now is only being
  used by WSL confirmed by CPC

  [Original Bug Report]

  motd on demo of 20.04:

  Welcome to Ubuntu 20.04 LTS (GNU/Linux 4.19.84-microsoft-standard
  x86_64)

  ....

  26 updates can be installed immediately.
  0 of these updates are security updates.
  To see these additional updates run: apt list --upgradable

  /usr/lib/ubuntu-release-upgrader/release-upgrade-motd: 31: cannot
  create /var/lib/ubuntu-release-upgrader/release-upgrade-available:
  Permission denied

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