unity8 crashed with SIGABRT in qt_message_fatal()

[rebel maroc]

failed to start unity8

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: unity8 7.84+14.04.20140221-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CrashCounter: 1
Date: Tue Feb 25 14:17:48 2014
ExecutablePath: /usr/bin/unity8
InstallationDate: Installed on 2014-01-31 (24 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
ProcCmdline: unity8
Signal: 6
SourcePackage: unity8
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: unity8 crashed with SIGABRT in QMessageLogger::fatal()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 qt_message_fatal (context=..., message=...) at global/qlogging.cpp:868
 QMessageLogger::fatal (this=<optimized out>, msg=<optimized out>) at global/qlogging.cpp:356
 QXcbConnection::QXcbConnection (this=0x24b3940, nativeInterface=0x24b38a0, displayName=0x0) at qxcbconnection.cpp:284
 QXcbIntegration::QXcbIntegration (this=0x24b10d0, parameters=...) at qxcbintegration.cpp:105
 QXcbIntegrationPlugin::create (this=<optimized out>, system=..., parameters=...) at main.cpp:58

[Michał Sawicz (saviq)]

Can you please add .cache/upstart/unity8.log?

[Launchpad Janitor (janitor)]

[Expired for unity8 (Ubuntu) because there has been no activity for 60 days.]