package gdm 3.0.4-0ubuntu15 failed to install/upgrade: subprocess installed pre-removal script was killed by signal (Befejeződött)

I reinstalled gdm after experienced a fast increase of the Xorg.1.log and the size of some log files in /var/log/gdm/. During the boot process it drops me on low graphics mode but after that starts with native resolution. I use Gnome Classic without effects (because Unity regularly crashing), but under the Gnome Classic there were no crash warnings. Now I booted into LXDE end the crash warnings popped up.

lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

apt-cache policy gdm
gdm:
  Telepítve: 3.0.4-0ubuntu15
  Jelölt: 3.0.4-0ubuntu15
  Verziótáblázat:
 *** 3.0.4-0ubuntu15 0
        500 http://archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: gdm 3.0.4-0ubuntu15
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic i686
ApportVersion: 2.0.1-0ubuntu8
AptOrdering: gdm: Purge
Architecture: i386
Date: Mon Jun 4 13:11:37 2012
DpkgTerminalLog:
 Eltávolítás: gdm ...
 g_dbus_connection_real_closed: Remote peer vanished with error: Underlying GIOStream returned 0 bytes on an async read (g-io-error-quark, 0). Exiting.
 dpkg: hibás feldolgozás: gdm (--purge):
  subprocess installed pre-removal script was killed by signal (Befejeződött)
ErrorMessage: subprocess installed pre-removal script was killed by signal (Befejeződött)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
SourcePackage: gdm
Title: package gdm 3.0.4-0ubuntu15 failed to install/upgrade: subprocess installed pre-removal script was killed by signal (Befejeződött)
UpgradeStatus: Upgraded to precise on 2012-04-27 (38 days ago)