[Bug 1855092] Autopkgtest regression report (pam/1.3.1-5ubuntu1.19.10.0)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted pam (1.3.1-5ubuntu1.19.10.0) for eoan have finished running.
The following regressions have been reported in tests triggered by the package:

systemd/unknown (armhf)
lxc/3.0.4-0ubuntu1 (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/eoan/update_excuses.html#pam

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

Thank you!

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https://bugs.launchpad.net/bugs/1855092

Title:
  [SRU] Please set MOTD_SHOWN=pam when MOTD was shown

Status in pam package in Ubuntu:
  Fix Released
Status in pam source package in Eoan:
  Fix Committed

Bug description:
  [Impact]

    * Users of containers may never see the MOTD of the container if they are always to the container's shell without PAM being involved.
    * MOTD contains important information about the system's health including the security updates to be installed thus it is desired to show MOTD in container shells, too.
    * The fix in update-motd is creating a snippet in /etc/profile.d which shows MOTD, but only if UPDATE_MOTD is not set, to avoid printing MOTD twice.

  [Test Case]

   * Log in to the system, where PAM prints the MOTD.
   * After seeing the MOTD observe MOTD_SHOWN set:
     $ echo $MOTD_SHOWN
     pam
     $

  [Regression Potential]

   * The fix is simple thus it is unlikely to see any regression due to bad implementation.
   * The newly set environment variable may interact with existing software, but this variable seems to be not used:
   https://codesearch.debian.net/search?q=MOTD_SHOWN&literal=1

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