I get the following msg: The package system is broken Check if you are using third party repositories. If so disable them, since they are a common source of problems. Furthermore run the following command in a Terminal: apt-get install -f. The following packages have unmet dependencies: gnome-icon-theme-full: Depends: gnome-icon-theme (= 3.4.0-0ubuntu1) but 3.4.0-0ubuntu1.1 is installed libreoffice-core: Depends: libgcc1 (>= 1:4.1.1) but 1:4.6.3-1ubuntu5 is installed linux-headers-generic: Depends: linux-headers-3.2.0-27-generic but it is not installed linux-headers-generic-pae: Depends: linux-headers-3.2.0-27-generic-pae but it is not installed