Hello, please run from a terminal window :
sudo apt-get clean sudo apt-get update sudo apt-get install -f and attach the outputs. Jörg ** Package changed: dpkg (Ubuntu) => mono (Ubuntu) ** Changed in: mono (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mono in Ubuntu. https://bugs.launchpad.net/bugs/1270035 Title: package mono-gac 2.10.8.1-5ubuntu2 failed to install/upgrade: package mono-gac is already installed and configured Status in “mono” package in Ubuntu: Incomplete Bug description: package failed to install ProblemType: Package DistroRelease: Ubuntu 13.10 Package: mono-gac 2.10.8.1-5ubuntu2 ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 Uname: Linux 3.11.0-15-generic x86_64 ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 Date: Thu Jan 16 11:53:20 2014 DuplicateSignature: package:mono-gac:2.10.8.1-5ubuntu2:package mono-gac is already installed and configured ErrorMessage: package mono-gac is already installed and configured InstallationDate: Installed on 2014-01-16 (0 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MarkForUpload: True PackageArchitecture: all SourcePackage: dpkg Title: package mono-gac 2.10.8.1-5ubuntu2 failed to install/upgrade: package mono-gac is already installed and configured UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mono/+bug/1270035/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp