Kubuntu

Kubuntu is an official derivative of Ubuntu. It uses the KDE desktop, cross platform applications and the Kontact package manager. .

Applications
Kubuntu users can install GNOME and any GNOME based packages that are available in the repositories just as Ubuntu users can install any KDE based app available in in it's repositories.

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Release cycle
The release cycle is the same as Ubuntu's as is the naming/ version system. It can be installed using either KDE 3.5 or the KDE 4.x version.