This simple tutorial will show you how to install or upgrade the newly released KDE 4.9 in Ubuntu 12.04 Precise Pangolin.

After six months of hard work, KDE announced its latest set of releases, KDE Plasma Workspaces, KDE Applications, and the KDE Platform version 4.9.0 on August 1, 2012. Provided many interesting and new features, quality improvements, and new updated applications. (Read announcement)

Install KDE 4.9 in Ubuntu:

The Kubuntu Backports PPA has updated KDE 4.9 for (K)Ubuntu 12.04 Precise. So we can install or upgrade from this ppa. If you’re running on Ubuntu 11.10 Oneiric, please wait this ppa update for it!

Hit Ctrl+Alt+T to open terminal, add ppa by pasting following command and execute:

sudo add-apt-repository ppa:kubuntu-ppa/backports

Then run this command to update:

sudo apt-get update

Upgrade to KDE 4.9:

sudo apt-get upgrade

Or install kubuntu-desktop package via Ubuntu Software Center if you first time installing KDE.

Uninstall KDE 4.9 (optional):

If you would like to uninstall KDE 4.9, or downgrade to previous installed version. Press Ctrl+Alt+T to launch a terminal window, then run following commands one by one.

sudo apt-get install -y ppa-purge

sudo ppa-purge ppa:kubuntu-ppa/backports

sudo apt-get -f -y autoremove