Calibre consistently freezes the operating system on startup

[Barry Drake]

On startup, Calibre goes to the welcome screen and the desktop freezes. If left for ten minutes or so, the desktop restarts at the login screen. Calibre has been fine under 12.04 but the problem occurs on Quantal 12.10

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: calibre 0.8.51+dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-3.3-generic 3.5.0-rc5
Uname: Linux 3.5.0-3-generic i686
ApportVersion: 2.2.5-0ubuntu2
Architecture: i386
Date: Mon Jul 9 19:12:43 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120627)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: calibre
UpgradeStatus: No upgrade log present (probably fresh install)

[Barry Drake (b-drake)]

Sorry - Quantal 12.10 ....

[Launchpad Janitor (janitor)]

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

[Sasa Paporovic (melchiaros)]

I have set this as duplicate, because of more valuable information in

https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1024750