unable to install many of the software packages from software-center

[Wilfried Klug]

wilfried@Macross:~/Arbeitsfläche$ lsb_release -a;uname -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.1 LTS
Release: 12.04
Codename: precise
Linux Macross 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
wilfried@Macross:~/Arbeitsfläche$

wilfried@Macross:~/Arbeitsfläche$ apt-cache policy qmail
qmail:
  Installiert: 1.06-4
  Kandidat: 1.06-4
  Versionstabelle:
 *** 1.06-4 0
        500 http://de.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status

wilfried@Macross:~/Arbeitsfläche$ ubuntu-bug qmail

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: qmail 1.06-4
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Sun Oct 21 20:26:56 2012
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: netqmail
UpgradeStatus: No upgrade log present (probably fresh install)