signon-ui crashed with SIGABRT in QMessageLogger::fatal()

[Lockal]

signon-ui crashed after upgrading the system and migrating from unity to gdm/gnome.

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: signon-ui 0.15+13.10.20131003.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-11.17-generic 3.11.3
Uname: Linux 3.11.0-11-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu1
Architecture: amd64
Date: Sat Oct 5 22:34:20 2013
ExecutablePath: /usr/bin/signon-ui
InstallationDate: Installed on 2012-02-05 (608 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120201.1)
MarkForUpload: True
ProcCmdline: /usr/bin/signon-ui
Signal: 6
SourcePackage: signon-ui
StacktraceTop:
 QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
 ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
 ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
 QGuiApplicationPrivate::createPlatformIntegration() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
Title: signon-ui crashed with SIGABRT in QMessageLogger::fatal()
UpgradeStatus: Upgraded to saucy on 2013-05-19 (139 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Launchpad Janitor (janitor)]

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

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1194732, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Lockal (lockal)]

Private bug -- not a bug. Please set normal permissions before marking this report as a duplicate.

[David Moffatt (david-c-moffatt)]

I just upgraded to 15.10 and hit this. I can't use the box because the menu does not come up. Nor can I look at bug 1194732.

[David Moffatt (david-c-moffatt)]

david:~$ /usr/bin/signon-ui
This application failed to start because it could not find or load the Qt platform plugin "xcb".

Reinstalling the application may fix this problem.

Look like it has a problem finding xcb. I tried sudo apt-get -reinstall install xcb. -- Did not help.

[Meruzhan Kerobyan (kerobyan-mk)]

There is a workaround to this problem
from terminal execute the following:

1. sudo apt-get --reinstall install signon-ui
2. sudo apt-get --reinstall install signon-ui-x11
3. sudo apt-get --reinstall install signon-ui-service

Then restart.
It has worked for me.

[Aalaap Ghag (aalaap)]

I had been facing this problem since I upgraded 14.04 to 15.xx and recently 16.10. @kerobyan-mk's method of reinstalling signon-ui worked for me too.