1. Add these lines to your /etc/apt/sources.list file:
For Lucid [STABLE] (2 lines):
deb http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu lucid main
deb-src http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu lucid main

For Karmic [OLDSTABLE] (2 lines):
deb http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu karmic main

For Jaunty [OLDSTABLE] (4 lines):
deb http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu jaunty main
deb http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu intrepid main
deb-src http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu intrepid main

For Intrepid [OLDSTABLE] (2 lines):
deb http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu intrepid main
deb-src http://ppa.launchpad.net/kde3-maintainers/ppa/ubuntu intrepid main

2. Add the GPG signing key:
wget http://apt.pearsoncomputing.net/public.gpg
sudo apt-key add public.gpg

3. Install KDE 3.5:
sudo apt-get update
sudo apt-get install kubuntu-desktop-kde3

There is a mailing list available here. I strongly suggest you subscribe to the low traffic announce list so that you can receive notifications of scheduled upgrades, etc.

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