Public bug reported:

After an upgrade had  problems and seemed X or Unity was always crashing. Got 
it running in "most-stable" mode. Which means every now  and then firefox tabs 
stop working (affects only the active window of firefox the others remain fully 
operational).
And after rebooting, or logging out the error message keeps on showring.

Have tried to google for a solution but still none so far.

Description:    Ubuntu 14.04.3 LTS

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.6+14.04.20151021-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
Uname: Linux 3.13.0-74-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.96  Sun Nov  8 22:33:28 
PST 2015
 GCC version:  gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,resize,regex,imgpng,mousepoll,move,place,vpswitch,grid,animation,gnomecompat,workarounds,unitymtgrabhandles,wall,session,showmouse,expo,fade,opacify,scale,unityshell]
CurrentDesktop: Unity
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order 
/var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission 
denied
Date: Tue Dec 29 14:25:59 2015
DistUpgraded: 2015-11-20 15:50:07,518 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
GraphicsCard:
 NVIDIA Corporation G96GL [Quadro FX 580] [10de:0659] (rev a1) (prog-if 00 [VGA 
controller])
   Subsystem: NVIDIA Corporation Device [10de:063a]
InstallationDate: Installed on 2010-11-28 (1856 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: Hewlett-Packard HP Z600 Workstation
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-74-generic 
root=UUID=670cfee5-d82e-4d51-a581-b2b71a0eadec ro quiet splash
SourcePackage: unity
UpgradeStatus: Upgraded to trusty on 2015-11-20 (38 days ago)
dmi.bios.date: 04/23/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786G4 v03.08
dmi.board.asset.tag: CZC0278TWC
dmi.board.name: 0B54h
dmi.board.vendor: Hewlett-Packard
dmi.board.version: D
dmi.chassis.asset.tag: CZC0278TWC
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr786G4v03.08:bd04/23/2010:svnHewlett-Packard:pnHPZ600Workstation:pvr:rvnHewlett-Packard:rn0B54h:rvrD:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP Z600 Workstation
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.65+git20151026.c745e541-0ubuntu0ricotz~trusty
version.libgl1-mesa-dri: libgl1-mesa-dri 
11.0.4~git20151026+11.0.ec14e6f8-0ubuntu0ricotz~trusty
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 
11.0.4~git20151026+11.0.ec14e6f8-0ubuntu0ricotz~trusty
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.4.99+git20140806.fbf575cb-0ubuntu0sarvatt~trusty
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20151202.da9ad388-0ubuntu0sarvatt~trusty
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11+git20141030.3fb97d78-0ubuntu0sarvatt~trusty2
xserver.bootTime: Tue Dec 29 12:42:45 2015
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        Hewlett-Packard Company HP USB Smart Card Keyboard KEYBOARD, id 8
 input        HP HP USB Laser Mouse MOUSE, id 9
 input        HP WMI hotkeys       KEYBOARD, id 10
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.15.1-0ubuntu2.7

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages trusty ubuntu

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https://bugs.launchpad.net/bugs/1529858

Title:
  Right after  login error message shows. Also Unity is behaving
  unstable

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