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If you install Ubuntu 9.10 the default desktop manager is Gnome.
Im pretty happy to use Gnome.
so you can do so, bring up a terminal window by hitting ALT+F2 and typing gnome-terminal.
This suggests that we have added Kubuntu PPA repositories to the software sources.
sudo apt-get updatesudo apt-get dist-upgradesudo apt-get install kubuntu-desktop
This should install KDE 4.4 RC on your Ubuntu machine.
The following are a couple screenshots of KDE desktop environment.
KDE has a lot of eye candy, great themes, and wallpaper support.