There are some restricted extras in ubuntu which is not installed by default, In this tutorials i will discuss how to install Ubuntu restricted extras in Ubuntu 11.04/11.10.
To install Restricted Extras open Terminal.
1. First open a terminal (ctrl_+lt+t)and issue the following command:

sudo apt-get update

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2. Next install ubuntu restricted extras with the following command:

sudo apt-get install ubuntu-restricted-extras

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3. When prompted, read the following that appeared on the terminal and wait until the installation is finish.
Note: Most of the restricted extras are mp3 playback and decoding, java, fonts, video codec, dvd playback and support for various formats.
 
UbuntuPirates 🙂