[hobarrera]

It's not that simple. Ubuntu has a lot of patches to make stuff interact nicely, and installing a diferent DE/WM is not as trivial as you'd think.

The opposite is true in Arch: it's extremely simple to change de WM, and chances of breaking anything else are minimal. This is especially due to the fact that you build the system yourself, so you know exactly what changing the WM affects.

[crdoconnor]

apt-get install xubuntu-desktop

apt-get install kubuntu-desktop

it is as trivial as you'd think.

[tormeh]

I second this. I have both KDE and GNOME Shell installed and working on Ubuntu. They really are one-liners.