during installing software the sysstem hangs in the Debconf screen

[lnzn]

using Ubuntu 12.10
debconf:
  Geïnstalleerd: 1.5.46ubuntu1
  Kandidaat: 1.5.46ubuntu1
  Versietabel:
 *** 1.5.46ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ quantal/main i386 Packages
        100 /var/lib/dpkg/status

I cannot install any new software or udates from Ubuntu. The installationproces starts normally but 'hangs' when the DebConf screen appears.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: debconf 1.5.46ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu9
Architecture: i386
CheckboxSubmission: e45668df1906cc03737f0343975f8d14
CheckboxSystem: b5acb6c9ca4017b1d44043910f45329d
Date: Fri May 10 12:22:30 2013
InstallationDate: Installed on 2012-04-22 (382 days ago)
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SourcePackage: debconf
UpgradeStatus: Upgraded to quantal on 2012-11-22 (169 days ago)

[Launchpad Janitor (janitor)]

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

[lucio messina (lucio-messina-w)]

I also have this problem.
I can install software, but I always see a window titled "debconf on <hostmame>".

This does not appear if I install package trough apt-get or synaptic