Installing KDE 4.3.1 in Kubuntu

KDE 4.3.1 contains bugfix, translation and maintenance update for the latest generation of the most advanced and powerful free desktop. KDE 4.3.1 is a monthly update to KDE 4.3. It ships with a desktop workspace and many cross-platform applications such as administration programs, network tools, educational applications, utilities, multimedia software, games, artwork, development tools and more. KDE's award-winning tools and applications are available in more than 50 languages.

Enhancements:
As a service release, the changelog contains a list of bugfixes and improvements. Notable improvements include, but are not limited to:

    * KDE 4.3 is now also available in Croatian
    * A crash when editing toolbar setup has been fixed
    * Support for transferring files through SSH using KIO::Fish has been fixed
    * A number of bugs in KWin, KDE's window and compositing manager has been fixed
    * A large number of bugs in KMail, KDE's email client are now gone

Installation:
Open/Edit sources.list: $ vi /etc/apt/sources.list

Add the following repository at the end of the file. Save the file when you are done:

    deb http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu jaunty main

It is strongly recommended that you verify the integrity of these repositories packages by installing the archive's GPG key. You may do this by running the following commands:

gpg --keyserver keyserver.ubuntu.com --recv 2836CB0A8AC93F7A

gpg --export --armor 2836CB0A8AC93F7A | sudo apt-key add -

Now you can update your list and do a dist-upgrade to upgrade to KDE 4.3.1 :

$sudo apt-get update

$sudo apt-get dist-upgrade