How to play mp3 and another restricted codes in ubuntu karmic 9.10

By default, ubuntu doesn’t include mp3 codec when we installed it on our Desktop, We need to install the codec first to make it work. if not, when we play mp3, it will give us output :
All you need is install the restricted package ( Ubuntu restricted Extras ). Make sure you already update your repository list by command : sudo apt-get update
To install the codecs, use command :

sudo apt-get install ubuntu-restricted-extras

This is will install mp3 codec, Sun java6 plugin, cabextract, microsoft font, and another library. The size is about 60 Mb. After install it, you can test your mp3 file in your favorite player