[Bug 1613184] [apt/xenial] possible regression found

[Ubuntu Foundations Team Bug Bot]

As a part of the Stable Release Updates quality process a search for
Launchpad bug reports using the version of apt from xenial-proposed was
performed and bug 1728596 was found.  Please investigate this bug report
to ensure that a regression will not be created by this SRU. In the
event that this is not a regression remove the "verification-failed" tag
from this bug report and add the tag "bot-stop-nagging" to bug 1728596
(not this bug). Thanks!

** Tags added: verification-failed

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https://bugs.launchpad.net/bugs/1613184

Title:
  method mirror broken at 1.3

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  Fix Committed
Status in apt source package in Zesty:
  Fix Committed

Bug description:
  [Impact]
  The mirror method always dies with a SEGV. It does not initialize _system but calls a function that sometimes uses it.

  [Test case]
  Use a mirror sources.list entry like

  deb mirror://mirrors.ubuntu.com/mirrors.txt zesty main restricted
  universe multiverse

  [Regression potential]
  The fix is small, and simply avoids using _system if _system is NULL in the called method. There should not be any regressions due to this.

  https://anonscm.debian.org/cgit/apt/apt.git/commit/?id=cba5c5a26a9bf00724f8ea647ac61b30e32734ba

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