Public bug reported:

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_ref: assertion
'object->ref_count > 0' failed

(firefox:4791): GLib-GObject-CRITICAL **: g_object_unref: assertion
'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4864): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:4950): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5018): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5083): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5219): GLib-GObject-CRITICAL **: g_object_unref: 
assertion 'object->ref_count > 0' failed
ubuntu-bug ubuntu-release-upgrader-core
sylvie@ubuntu:~$ 
(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref: 
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5253): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **: g_object_ref:
assertion 'object->ref_count > 0' failed

(/usr/lib/firefox/firefox:5569): GLib-GObject-CRITICAL **:
g_object_unref: assertion 'object->ref_count > 0' failed

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.10
ProcVersionSignature: Ubuntu 3.13.0-155.205-generic 3.13.11-ckt39
Uname: Linux 3.13.0-155-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.29
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Aug 15 12:07:59 2018
InstallationDate: Installed on 2012-10-16 (2128 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120822.4)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2018-08-15 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade trusty

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https://bugs.launchpad.net/bugs/1787164

Title:
  impossible to upgrade from 14-04 to 16-04

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