Packages for the release of KDE SC 4.11 are available for Kubuntu 12.04LTS, 12.10, 13.04 and our development release. You can get them from the Kubuntu Backports PPA.
To update, use the Software Repository Guide to add the following repository to your software sources list:
13.04, 12.10, 12.04LTS:
Or, from your konsole:
Thanks to Philip, Jonathan, Rohan and Howard for their work on these packages