Black screen on startup

[Jean-Sébastien]

My screens is fully black for around 3-5 seconds when I start Lubuntu.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: notification-daemon 0.7.5-1
ProcVersionSignature: Ubuntu 3.5.0-1.1-generic 3.5.0-rc3
Uname: Linux 3.5.0-1-generic i686
ApportVersion: 2.2.5-0ubuntu1
Architecture: i386
Date: Tue Jun 26 16:33:55 2012
ExecutablePath: /usr/lib/notification-daemon/notification-daemon
InstallationMedia: Lubuntu 11.04 "Natty Narwhal" - i386 (20101203)
ProcCmdline: /usr/lib/notification-daemon/notification-daemon
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
Signal: 5
SourcePackage: notification-daemon
UpgradeStatus: Upgraded to quantal on 2012-06-25 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
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[Apport retracing service (apport)]

Thank you for your report!

However, processing it in order to get sufficient information for the
developers failed (it does not generate a useful symbolic stack trace). This
might be caused by some outdated packages which were installed on your system
at the time of the report:

libglib2.0-0 version 2.33.2-1 required, but 2.33.3-1 is available
outdated debug symbol package for libatk1.0-0: package version 2.5.3-0ubuntu1 dbgsym version 2.4.0-2
libxft2 version 2.2.0-3ubuntu2 required, but 2.3.1-1 is available

Please upgrade your system to the latest package versions. If you still
encounter the crash, please file a new report.

Thank you for your understanding, and sorry for the inconvenience!