kubuntu 12.04 [64 bit]

Kubuntu is an operating system built by a worldwide team of expert developers. It contains all the applications you need: a web browser, an office suite, media apps, an instant messaging client and many more.
Kubuntu is an open-source alternative to Windows and Office.
Built on Ubuntu's core and polished with KDE’s applications and workspaces, Kubuntu 12.04 LTS is a grand example of friendly, fast and beautiful software. We recommend it as the perfect OS for casual users, students, Linux gamers, software developers, professionals, and anyone interested in a free, open platform that is both beautiful and useful.
Highlights include:
Improvements in speed and rendering in Dolphin
Redesigned power management configuration - settings are now Activity-aware
New Icon Tasks provides an alternative icon-only taskbar