That’s the KDE Plasma Desktop – I am running it on ARCH Linux, but the new Kubuntu (which I have on my laptop, and looks exactly the same) <a href="http:&#x2F;&#x2F;www.kubuntu.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.kubuntu.org&#x2F;</a> has the same desktop.<p>The wallpaper is from <a href="http:&#x2F;&#x2F;imgur.com&#x2F;gallery&#x2F;dbELn" rel="nofollow">http:&#x2F;&#x2F;imgur.com&#x2F;gallery&#x2F;dbELn</a>