Karmic users, can upgrade to the latest packages.

Users of 9.04 :

echo 'deb http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu jaunty main' >> /etc/apt/source.list


To verify the integrity of these packages by installing the archive's GPG key.Download the attached key and do an import.
gpg --import key
Then do a normal update sudo apt-get update
sudo apt-get upgrade
You might be warned during installation check the packages and say yes to install.