package fontconfig 2.11.94-0ubuntu1.1 failed to install/upgrade: triggers looping, abandoned

Bug #1617020 reported by Boki on 2016-08-25
This bug affects 6 people
Affects Status Importance Assigned to Milestone
fontconfig (Ubuntu)

Bug Description

I was upgrading from 14.04 to 16.04 as suggested by the GUI.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: fontconfig 2.11.94-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
Uname: Linux 3.13.0-93-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Thu Aug 25 20:03:10 2016
DuplicateSignature: package:fontconfig:2.11.94-0ubuntu1.1:triggers looping, abandoned
ErrorMessage: triggers looping, abandoned
InstallationDate: Installed on 2015-01-27 (575 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: fontconfig
Title: package fontconfig 2.11.94-0ubuntu1.1 failed to install/upgrade: triggers looping, abandoned
UpgradeStatus: Upgraded to xenial on 2016-08-25 (0 days ago)

Boki (solidreno) wrote :
tags: removed: need-duplicate-check
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in fontconfig (Ubuntu):
status: New → Confirmed
dleh (daniel-hammer) wrote :

I too was affected by this bug.

Running 14.04.5 (ASUS NX500J Notebook), no outstanding updates - but HWE upgrade performed to 16.04 compatible as prompted before upgrade, upgrade from terminal to 16.04.1:

$ sudo do-release-upgrade

Failed as described by Boki during initial upgrade.

Upon reboot I was unable to login via the UI, the UI looked messed up and was unresponsive.
But I could access the terminal via: ctrl+alt+f1

I was able to restore a seemingly working 16.04.1 using the following steps:

$ sudo apt-get dist-upgrade
This showed that I was missing a couple of dependencies, the names escape me - but it wasn't the offending package.

$ sudo apt-get -f install
Installed missing dependencies.

$ sudo apt-get dist-upgrade
This showed a large number of unneeded packages and more importantly a even larger number of up-gradable packages
I installed them, while being randomly being prompted for the password for the encrypted swap-partition.
It took a while but it succeeded.

Changed in fontconfig (Ubuntu):
importance: Undecided → High
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