Public bug reported:

Occasionally, gnome shell locks up right after lightdm login. The mouse
moves, but nothing responds to clicks. Keyboard is ignored.

I've found a work-around suitable for technical people only, which is to
Ctrl-Alt-F1, log in, and type pkill -HUP gnome-shell, then log out and
go back with Alt-F7.

At the command prompt, I observed 2 zombie lightdm processes. Not sure
if related. Figured it was a gnome bug because restarting gnome-shell
fixes it.

Having now rolled gnome-shell desktops out in my business to non-
technical users, this is a serious bug: most of them have to do a hard
reset.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-shell 3.4.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
Uname: Linux 3.2.0-30-generic x86_64
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
Date: Tue Oct  2 09:23:27 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1060052

Title:
  gnome shell freezes on startup. intermittent

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