Zoals dat staat in de link in mijn vorige post.
8.10 (Intrepid)
Packages for Kubuntu 8.10 can be installed by following the instructions below. If you installed KDE 4.2 Beta or RC you can merely update your existing installation.
Note: These packages are not supported by Canonical; for a stable system it is not recommended to upgrade. KDE 4.2 will be officially supported as part of Kubuntu 9.04 being released April 23rd 2009.
Instructions
The updated packages for Kubuntu 8.10 are in Unsupported Updates (backports). To update to KDE 4.2, please follow these instructions:
1. Remove the koffice-data-kde4 package if you have it installed. The current koffice2 packages in the kubuntu-members-kde4 PPA are incompatible with the KDE 4.2 packages since they try to install icons to the same locations.
2. Follow the Kubuntu Repository Guide to enable Recommended Updates and Unsupported Updates.
3. Old Plasma packages are not compatible with KDE 4.2, you should uninstall any plasmoids.
4. You can now update any existing KDE 4 installation to 4.2 with Full Upgrade in the package manager, or using the Adept Updater tool in your system tray.
5. Now log out. When you log in you will have KDE 4.2. Enjoy.