Kubuntu is an operating system built by a worldwide community of developers, testers, supporters and translators. Kubuntu is a free, complete, and open-source alternative to Microsoft Windows and Mac OS X which contains everything you need to work, play, or share. Check out the Feature Tour if you would like to learn more! Kubuntu unites Ubuntu with KDE and the fabulous Plasma desktop, bringing you a full set of applications. The installation includes productivity, office, email, graphics, photography, and music applications ready to use at startup.
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The best edition from the *buntu distro family, as it features the best desktop environment in existence: KDE Plasma.
The best GNU/Linux operating system distribution from the *buntu family, because it comes with KDE Plasma which is by far most powerful, beautiful, flexible/customizable desktop environment in existance.