The only problem you will find is that some of the many distributions do not ship with KDE installed. If you want KDE on these distributions you must install it. In this article I am going to walk you through the steps for installing the latest KDE on a Ubuntu system. More here

Now you may be saying to yourself: “Why don’t I just install Kubuntu and be done with it? That’s a good question. The answer? Most new users have no idea that Kubuntu even exists and will have already installed the GNOME-based Ubuntu. For those people who already have their Linux running, they might want to give the KDE desktop a try as well