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[Launchpad Bug Tracker <1828639@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package dpkg - 1.18.4ubuntu1.6

---------------
dpkg (1.18.4ubuntu1.6) xenial; urgency=medium

  * Cherry-pick upstream fixes for trigger loops (LP: #1828639)
    - dpkg: Negate tortoise_not_in_hare() function name and return value
    - dpkg: Initialize trigcyclenode's next member once
    - dpkg: Factor trigproc_new_cyclenode() out from check_trigger_cycle()
    - dpkg: Mark the package we are giving up on a trigger cycle as istobe normal
    - dpkg: Switch dependtry from an int to an enum
    - dpkg: Reset progress_bytrigproc once we have injected into the current iteration
    - dpkg: Split trigger processing types into required, try-queued and try-deferred
    - dpkg: Convert one trigger processing required type into the new try-queued
    - dpkg: Move trigproc cycle reset inside try-deferred conditional
    - dpkg: Introduce a new dependency try level for trigger processing
    - dpkg: Introduce a new dependency try level for trigger cycle checks

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Tue, 16 Jul 2019 14:57:11
+0200

** Changed in: dpkg (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1828639

Title:
  Unlooping all the trigger loops!!!!!

Status in dpkg package in Ubuntu:
  Fix Committed
Status in dpkg source package in Xenial:
  Fix Released
Status in dpkg source package in Bionic:
  Fix Committed
Status in dpkg source package in Cosmic:
  Fix Committed
Status in dpkg source package in Disco:
  Fix Released
Status in dpkg source package in Eoan:
  Fix Committed

Bug description:
  [Impact]
  Quite a few bugs in triggers can cause distro upgrades to abort.

  [Test case]
  For cosmic -> disco, install ubuntu-mate-desktop and then upgrade.

  For other releases, there might not be any test cases

  We should at least run some upgrade tests for a system with ubuntu-
  desktop installed.

  [Regression potential]
  New trigger bugs could of course be caused by the changes.

  [Original bug report]

  Encountered when upgrading from cosmic to disco with ubuntu-mate-
  desktop installed.

  ProblemType: Package
  DistroRelease: Ubuntu 19.04
  Package: libvlc-bin 3.0.6-1
  ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
  Uname: Linux 5.0.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  Date: Fri May 10 22:48:10 2019
  ErrorMessage: 90.8592:triggers looping, abandoned
  Python3Details: /usr/bin/python3.7, Python 3.7.3, python3-minimal, 3.7.3-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.16, python-minimal, 2.7.16-1
  SourcePackage: vlc
  Title: package libvlc-bin 3.0.6-1 failed to install/upgrade: 90.8592:triggers looping, abandoned
  UpgradeStatus: Upgraded to disco on 2019-05-10 (0 days ago)

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