I ran the test case on a xenial-proposed machine successfully.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1625584

Title:
  Removing libnss-* does not remove corresponding options

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed

Bug description:
  libnss-{resolve,mymachines,myhostname} automatically add/remove
  themselves from /etc/nsswitch.conf on installation/removal.

  But when (manually) adding NSS action specifiers, these do not get
  removed along.

  SRU FIX: https://anonscm.debian.org/cgit/pkg-
  systemd/systemd.git/commit/?h=ubuntu-xenial&id=2d08d7e481

  TEST CASE:
    * Install libnss-mymachines. This will change the "hosts" line in 
/etc/nsswitch.conf from e. g. "files dns" to "files dns mymachines".
    * Edit the file to add an action specifier: "files dns mymachines 
[!UNAVAIL=return]"
    * Remove/purge libnss-mymachines.
    * In current xenial (229-4ubuntu7)/yakkety (231-6) the hosts line ends up 
as "files dns [!UNAVAIL=return]", i. e. the action specifier now applies to 
"dns" but should have been removed.
    * With the fixed version, the action specifier is completely gone.
    * Re-test with installing libnss-resolve (which inserts itself before 
"dns") and modifying to "files resolve [!UNAVAIL=return] dns [foo=bar]", then 
purge libnss-resolve again -- this should again remove the [!UNAVAIL=return] 
but *NOT* "dns [foo=bar]".

  Regression potential: This only affects package removal, so upgrades
  or new installs are not affected. Removals of
  libnss-{mymachines,myhostname,resolvle} must be tested carefully to
  ensure that they don't break nsswitch.conf in any way.

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