First thing first you need to add third party Repository
You will have to add the following launchpad repository to access this new updated version of KDE 4.3.
Step 1. Goto System > Administration > Software Sources and select the Third-Party Software tab. Click ADD. Copy the following repo there;
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deb http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu jaunty main
deb http://ppa.launchpad.net/kubuntu-ppa/staging/ubuntu jaunty main
Then select the "Updates" tab & select "Unsupported updates Jaunty-backports" + " Pre-released updates Jaunty-proposed"
Step 2. Resolving PPA Key Issue
Do the following to resolve the PPA Key issue:
Please, download the key file from below & go to the "Authentication" Tab & select "Import key file" Now browser to where you had saved the key file, select it & import.
Now close & Reload.
Step 3. Upgrading to all new KDE 4.3
All you need to do is, Goto Terminal and type:
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sudo aptitude update && sudo aptitude dist-upgrade
Then:
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sudo aptitude install kubuntu-desktop
Packages for Jaunty are not officially supported. KDE 4.3 will be part of Kubuntu Karmic 9.10 to be officially released this October.