(via shibuvarkala.blogspot.com)
Ubuntu 9.10 Required the following steps to Run Multimedia files like MP3, AVI, Mpeg, 3gp etc...
In Ubuntu 9.10 "Karmic Koala", the universe, multiverse and restricted repositories are activated by default.
karmic
How to make Ubnutu 9.10 Karmic Koala Multimedia Ready
Submitted by panayara on Wed, 11/18/2009 - 08:51