Het heeft volgens mij iets te maken met het enablen van je multiverse/universe repositories:
1. Open the Synaptic Package Manger from the Gnome System > Administration menu
2. Click on Settings and then Repositories
3. For each channel, click on Edit and tick the universe and multiverse checkboxes. If there are no checkboxes, add universe multiverse to the Components line
4. Click Close and return to Synaptic Package Manager
5. Click the Reload button in the toolbar
of via de terminal:
1. Open /etc/apt/sources.list using your favourite text editor as root (using sudo or gksudo
2. Add the following lines to the file:
deb
http://au.archive.ubuntu.com/ubuntu/ dapper universe multiverse
deb-src
http://au.archive.ubuntu.com/ubuntu/ dapper universe multiverse
3. From a terminal window, save the file and update apt
sudo apt-get update