[Bug 1840375] Autopkgtest regression report (shadow/1:4.2-3.1ubuntu5.5)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted shadow (1:4.2-3.1ubuntu5.5) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

nvidia-graphics-drivers-384/unknown (armhf)
nvidia-graphics-drivers-340/unknown (armhf)


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/xenial/update_excuses.html#shadow

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

Thank you!

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https://bugs.launchpad.net/bugs/1840375

Title:
  groupdel doesn't support extrausers

Status in snapd:
  Triaged
Status in shadow package in Ubuntu:
  Fix Released
Status in shadow source package in Xenial:
  Fix Committed
Status in shadow source package in Bionic:
  Fix Committed
Status in shadow source package in Disco:
  Fix Committed

Bug description:
  snapd needs the ability to call 'groupdel --extrausers foo' to clean
  up after itself, but --extrausers is currently unsupported.

  [Impact]
  On ubuntu-core systems we want to be able to manage "extrausers" in the same
  way as regular users. This requires updates to the various {user,group}{add,del} tools. Right now "groupdel" cannot handle extrausers.

  This is an important feature for Ubuntu Core

  [Test Case]
  0. upgrade the "passwd" to the version in {xenial,bionic}-proposed
  1. install the libnss-extrausers and add "extrauers" to the passwd and shadow line (see /usr/share/doc/libnss-extrausers/README for the modifications in sswitch.conf)
  2. run "groupadd --extrausers foo" and verify "grep foo /var/lib/extrausers/group"
  3  check /var/lib/extrausers/group for the new "foo" group
  4. run "groupdel --extrausers foo"
  5. check /var/lib/extrausers/group and ensure the "foo" group is removed

  [Regression Potential]

   * low: this adds a new (optional) option which is off by default

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