If you're using Ubuntu Breezy (aka 5.10) or Dapper (6.06) there's a handy script you might want to take a look at. Automatix is this neat thingy that does stuff to your Ubuntu system to make it work better.
See how good I am at describing it.
Or you could just listen to Arnieboy: "This is a graphical interface for installation of a lot of apps on Ubuntu/Kubuntu/Xubuntu BREEZY AND DAPPER (DOES NOT WORK ON Warty or Hoary) and for tweaking a few things to get your Ubuntu box up and working in full throttle in the quickest possible timespan."
Some of the cool things you can install include w32codecs (for watching porn), mplayer (for watching porn), realplayer (for watching porn), frostwire (for downloading porn), azureus (for downloading porn), wine (for getting drunk while watching porn), plus a whole heap of other stuff that doesn't seem to have much to do with porn for some reason.
The first time I tried Automatix it failed silently, claiming that the install was successful when in fact nothing had been installed. So I went on over to the forum and left a really helpful bug report ("This fucking sucks").
Then some guy replied and suggested that I needed to provide more information.
Well, I was not about to take that kind of abuse lying down, so I dashed off an immediate reply: "This really fucking sucks. Lots." How's that for more fucking information.
Anyway, then I went to bed. In the morning there was a new version available which fixed the problem, so it just goes to show that it really does pay to provide a more detailed bug report. Also, don't take any shit from those open source guys.
Find out about Automatix here: http://ubuntuforums.org/forumdisplay.php?f=77
The sticky posts at the top tell you all you need to know to install and use Automatix.
disclaimer: The bug report story above may differ from reality in some minor details - such as all of them.