update-manager wasn't able to install ubuntu-desktop

[Alexander Kallenbach]

Wanted to update my PC on which the first beta of Precise is running. Update-manager told me that it wasn't able to install ubuntu-desktop.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.7
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Mon Mar 12 14:37:01 2012
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1331559371
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 1000
 com.ubuntu.update-manager window-width 1280
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=de_DE:en
 TERM=xterm
 LANG=de_DE.UTF-8
 LC_MESSAGES=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-03-12 (0 days ago)