Packages for the release of the KDE Software Compilation 4.5.3 are available for Kubuntu 10.04.
Users of 10.04 can install it from the Kubuntu Backports PPA.
To update, use the Software Repository Guide to add the following repository to your software sources list:
Warning: Adding this PPA will make the computer unable to upgrade to 10.10 which has an older version of KDE Platform
Thanks to Markus Zimmermann for funding these packages.