Tasksel,Ubuntu 14.04 64bit,removing ubuntu desktop,aptititude failed (100)

[Sven.Frings]

Ubuntu 14.04 64 bit

8Gb Ram

Nvidia Geforce Gt 630 2gb vram

HDD 2 TB

HP Tower

1Gbit Network Card

Hey I´ts me again some days ago i want to remove ubuntu-desktop via comandline sudo tasksel remove ubuntu-desktop tasksel

start´s for a second and break up with a error message aptitude failed (100)

1. Ubuntu 14.04 64 bit

2.Tasksel

3.That tasksel remove my desktop i want to remove from my hard drive

4.tasksel:Aptitudefailed (100)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: tasksel 2.88ubuntu15
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
Date: Mon Jun 9 16:43:12 2014
InstallationDate: Installed on 2014-05-04 (35 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=de_DE
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: tasksel
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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