kdeinit5 crashed with SIGABRT in qt_message_fatal()

[wynn1212]

System: Ubuntu 14.10 (Development Branch)
After install kde 5 and sometimes it crashed
I have No idea

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: kinit 5.1.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu2
Architecture: amd64
Date: Sat Sep 20 11:06:26 2014
ExecutablePath: /usr/bin/kdeinit5
InstallationDate: Installed on 2014-07-24 (57 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcCmdline: klauncher\ [kdeinit5]\ --fd=8
ProcEnviron:

Signal: 6
SourcePackage: kinit
StacktraceTop:
 qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1340
 QMessageLogger::fatal (this=this@entry=0x7fff97a83290, msg=msg@entry=0x7fc03429aa20 "QXcbConnection: Could not connect to display %s") at global/qlogging.cpp:669
 QXcbConnection::QXcbConnection (this=0x104f120, nativeInterface=0x1034600, canGrabServer=<optimized out>, displayName=0x0) at qxcbconnection.cpp:322
 QXcbIntegration::QXcbIntegration (this=0x10357b0, parameters=..., argc=@0x7fff97a8367c: 2, argv=0x102dde0) at qxcbintegration.cpp:161
 QXcbIntegrationPlugin::create (this=<optimized out>, system=..., parameters=..., argc=@0x7fff97a8367c: 2, argv=0x102dde0) at qxcbmain.cpp:58
Title: kdeinit5 crashed with SIGABRT in qt_message_fatal()
UpgradeStatus: Upgraded to utopic on 2014-09-17 (2 days ago)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1340
 QMessageLogger::fatal (this=this@entry=0x7fff97a83290, msg=msg@entry=0x7fc03429aa20 "QXcbConnection: Could not connect to display %s") at global/qlogging.cpp:669
 QXcbConnection::QXcbConnection (this=0x104f120, nativeInterface=0x1034600, canGrabServer=<optimized out>, displayName=0x0) at qxcbconnection.cpp:322
 QXcbIntegration::QXcbIntegration (this=0x10357b0, parameters=..., argc=@0x7fff97a8367c: 2, argv=0x102dde0) at qxcbintegration.cpp:161
 QXcbIntegrationPlugin::create (this=<optimized out>, system=..., parameters=..., argc=@0x7fff97a8367c: 2, argv=0x102dde0) at qxcbmain.cpp:58

[Launchpad Janitor (janitor)]

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

[Mike Meehan (mjmeehan)]

This happens to me after upgrading to 15.04, Plasma crashes every time I log in, preventing me from using KDE.