Unhide is a program that will detect hidden processes on your system. It is a good complement to rkhunter (a rootkit scanner for Linux and Unix). Rkhunter will make use of unhide if you have unhide installed on your system. Here is a little tutorial on how to do it (I assume you have rkhunter already installed and configured, and are familiar with its use.):

First: I'm not an Ubuntu user, but I would like to help newbies to get XMMS working on Ubuntu Hardy Heron.
Why: a) A guy entered #xmms on Freenode and wanted to install XMMS on him Ubuntu, so I tried to help him.
b) XMMS is still a good player, and if somebody wants to use it, why not help him?

We will install XMMS from source, but there are alternatives though like:
1) change your distro

Ubuntu is one of the few Linux distributions out there that will not enable the root account (actually it is the only one I have seen myself, but hey, there might be others that I am not aware of). This is a very good idea and you should probably try to learn to use sudo for daily maintenance. But in case you want to enable root login on your Ubuntu system this little post will show you how you can do that.