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.

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

Status in signon-ui package in Ubuntu:

Bug description:
  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 
  MarkForUpload: True
  ProcCmdline: /usr/bin/signon-ui
  Signal: 6
  SourcePackage: signon-ui
   QMessageLogger::fatal(char const*, ...) const () from 
   ?? () 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 
  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

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