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[Launchpad Bug Tracker <1545884@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package shadow - 1:4.2-3.1ubuntu3

---------------
shadow (1:4.2-3.1ubuntu3) xenial; urgency=medium

  * d/p/1021_no_subuids_for_system_users.patch: fix the not creating subuids
    for system users.  (LP: #1545884)

 -- Serge Hallyn <serge.hallyn@xxxxxxxxxx>  Wed, 17 Feb 2016 20:57:59
-0800

** Changed in: shadow (Ubuntu Xenial)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1545884

Title:
  Xenial's shadow regresses subid allocation logic (wastes uids and
  gids)

Status in shadow package in Ubuntu:
  Fix Released
Status in shadow source package in Xenial:
  Fix Released

Bug description:
  Back in trusty I wrote a patch to shadow which makes sure we only ever
  allocate a 65k uid/gid map to new users that aren't a system user (no
  --system flag and not a system uid/gid).

  This has regressed recently in Xenial and on a fresh install I found
  myself with about 15 system users each having 65536 uids and gids
  allocated to them. That's wasteful and may end up creating accidental
  collisions when using network authentication.

  I have now upstreamed the change we used to have as a distro patch:
     https://github.com/shadow-maint/shadow/pull/12

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