KDE 4.2 has been released. Jaunty (current development release) users can do a full upgrade to get the latest packages. Packages for 8.10 (Intrepid) are in intrepid-backports.
For more information about the release itself, please see the Release Announcement
Packages for Jaunty (current development release) are available. If you use Jaunty you will be able to upgrade as normal.
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.
The updated packages for Kubuntu 8.10 are in Unsupported Updates (backports). To update to KDE 4.2, please follow these instructions:
KDE 4.2 uses Akonadi which will install MySQL. The MySQL packages in intrepid will ask for a password, you can set this to anything you like.
Digikam will not install alongside these packages due to conflicting library versions.
If you come across any issue which may be packaging related, it is recommended that you join the Kubuntu IRC channel (#kubuntu on irc.freenode.net) and query those in the channel for assistance.
Thanks to Harald "apachelogger" Sitter, Jonathan Riddell, Jonathan Thomas (aka JontheEchidna), Scott "ScottK" Kitterman and Steve Stalcup (aka vorian), Nathan Handler, Richard "Arby" Birnie and Roderick Greening for preparing and uploading these packages.
If you want to see your name above, then join the Kubuntu Team.
More information is available in the Kubuntu Wiki