Kubuntu is a Ubuntu derivated Linux distro using KDE desktop environment. It has stable core of Ubuntu, with KDE packed on top of it. Kubuntu ISO is still under a CD size (700MB). Kubuntu is made for people who are fond of KDE desktop environment but want to use Ubuntu like user-friendly and stable desktop operating system.

“Kubuntu 11.10 is a grand example of friendly, fast, and beautiful software. We recommend it as the perfect OS for casual users, social butterflies, Linux gamers, software developers, professionals, and anyone interested in a free, open platform that is both beautiful and useful.” – Kubuntu