Public bug reported:

After the most recent system update which brought new versions of
Chromium and Firefox, Chromium starts to freeze and become unresponsive.

At this point you still have mouse pointer control.

Click around on the launcher a few times, nothing gets launched, and
then Ubuntu itself completely freezes up.

The only escape is to press down on the PC power button and force a
hardware shutdown.

This behaviour is intermittent but has happened twice since the above
mentioned system update.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: chromium-browser 45.0.2454.85-0ubuntu0.14.04.1.1097
ProcVersionSignature: Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25
Uname: Linux 3.13.0-63-generic i686
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: i386
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: Fri Sep 25 10:26:42 2015
Desktop-Session:
 'ubuntu'
 '/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg'
 '/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/'
EcryptfsInUse: Yes
Env:
 'None'
 'None'
InstallationDate: Installed on 2014-04-29 (513 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
Load-Avg-1min: 0.56
Load-Processes-Running-Percent:   0.6%
MachineType: Dell Inc. Inspiron 660
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-63-generic 
root=UUID=8cf458ab-4ff9-4505-9a16-27da1ea7ec10 ro quiet splash vt.handoff=7
SourcePackage: chromium-browser
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/14/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0XR1GT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA11:bd10/14/2013:svnDellInc.:pnInspiron660:pvr:rvnDellInc.:rn0XR1GT:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.name: Inspiron 660
dmi.sys.vendor: Dell Inc.
gconf-keys: /desktop/gnome/applications/browser/exec = 
b'/usr/bin/chromium-browser\n'/desktop/gnome/url-handlers/https/command = 
b'/usr/bin/chromium-browser %s\n'/desktop/gnome/url-handlers/https/enabled = 
b'true\n'/desktop/gnome/url-handlers/http/command = b'/usr/bin/chromium-browser 
%s\n'/desktop/gnome/url-handlers/http/enabled = 
b'true\n'/desktop/gnome/session/required_components/windowmanager = 
b''/apps/metacity/general/compositing_manager = 
b''/desktop/gnome/interface/icon_theme = b''/desktop/gnome/interface/gtk_theme 
= b''
modified.conffile..etc.default.chromium.browser: [deleted]
mtime.conffile..etc.chromium.browser.default: 2014-04-29T13:58:11.849470

** Affects: chromium-browser (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 trusty

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https://bugs.launchpad.net/bugs/1499756

Title:
  Ubuntu 14.04 LTS freezes

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