[Bug 1873545] Re: Permission denied error from show-motd when updates available

[Ubuntu Foundations Team Bug Bot]

The attachment "update-motd_3.6-0ubuntu7.debdiff" seems to be a debdiff.
The ubuntu-sponsors team has been subscribed to the bug report so that
they can review and hopefully sponsor the debdiff.  If the attachment
isn't a patch, please remove the "patch" flag from the attachment,
remove the "patch" tag, and if you are member of the ~ubuntu-sponsors,
unsubscribe the team.

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** Tags added: patch

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

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

Status in Ubuntu WSL:
  In Progress
Status in update-motd:
  In Progress
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in update-motd package in Ubuntu:
  Confirmed

Bug description:
  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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