HOW TO: Get Full Multimedia Support and Playback Capabilities in Ubuntu Desktop Linux
The purpose of this how-to is to give Ubuntu desktop users (especially new ones coming from the 
Windows world) the guidance to enable full multimedia support and playback of popular media codecs and technologies in just 3 simple steps. Once completed, your Linux PC will have DVD (CSS) movie playback support, OGG / THEORA / AAC / MP3 / WMA / WMV/ DIVX / XVID / MPEG-1/2/4 / QuickTime support, Skype, Flash, RealPlayer, JAVA, and more.
Note: These instructions are based on Ubuntu’s latest release, 6.06 (Dapper), which integrates the Gnome Desktop Environment; however, the instructions provided should work with later releases.
Now, get ready to put both Totem, Gnome’s default media player, and the Firefox Web browser on steroids! eHomeUpgrade | How-To: Get Full Multimedia Support and Playback Capabilities in Ubuntu Desktop Linux