For Tommy
Martin, correct me here if I send wrong information.
Linux as an operating system is the kernel. Xorg is an application that gives you the visuals. Then you have another application that gives you a desktop environment. That's a major difference from Windows where the desktop environment is an inseparable part of the OS. On Linux the desktop environment is a separate application that your computer can function properly without.
So when we say Ubuntu, you have the Linux kernel, you have Xorg and you have by default a desktop environment called Gnome (which is what you see in front of you right now). Kubuntu is the exact same kernel and Xorg as Ubuntu but it has another desktop environment as default (it's the one I see in front of me right now and the one you saw in the screenshot I posted).
I can install Gnome on my Kubuntu and experience what you are experiencing and you can install KDE on yours and experience what I am experiencing. Of course my desktop has been customized as the default KDE does not look like the one I am having but that's just a simpler story that can be achieved by just modifying the looks.