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Ubuntu Lucid users can simply "sudo apt-get upgrade" to upgrade to the latest packages, because KDE 4.4 is already available in the main repository.

Ubuntu Karmic (9.10) users have to add the following PPA to install KDE 4.4 final:

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

Then, if you are already using KDE (Kubuntu):
sudo apt-get update && sudo apt-get dist-upgrade

If you want to install KDE:
sudo apt-get update && sudo apt-get dist-upgrade && sudo apt-get install kubuntu-desktop

Here are 2 videos with KDE 4.4 Beta 1 in action:

Please note: the post was initially about KDE 4.4 beta but since KDE 4.4 final has been released, the post was updated with the new PPA which has the latest KDE packages (final) for Ubuntu 9.10 Karmic Koala.