while running a partial upgrade because ppa libre office did not fully install and error report said ubuntu-desktop cannot be installedy

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while running a partial upgrade because ppa libre office did not fully install and error report said ubuntu-desktop cannot be installed

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.11
ProcVersionSignature: Ubuntu 3.2.0-58.88-generic 3.2.53
Uname: Linux 3.2.0-58-generic i686
ApportVersion: 2.0.1-0ubuntu17.6
Aptdaemon:
 Feb 3 06:10:28 n-Intel-powered-classmate-PC AptDaemon: INFO: Quitting due to inactivity
 Feb 3 06:10:28 n-Intel-powered-classmate-PC AptDaemon: INFO: Quitting was requested
Architecture: i386
Date: Mon Feb 3 06:22:18 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1391382417
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 576
 com.ubuntu.update-manager window-width 975
InstallationMedia: This
MarkForUpload: True
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-11-19 (440 days ago)