system update not working, proposed partial update (german: 'Teilsweise Systemaktualisierung')

[Bruno Katzengold]

system update not working,
(couldn't really figure out why)

system proposed partial update (german: 'Teilsweise Systemaktualisierung')
I followed this advice, then the error occured
hope this helps

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.7
ProcVersionSignature: Ubuntu 3.13.0-53.89-generic 3.13.11-ckt19
Uname: Linux 3.13.0-53-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Jun 12 16:33:20 2015
InstallationDate: Installed on 2014-10-09 (245 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)