How to install video codec file in ubuntu

Download and Install DivX Linux Codec

Open terminal and type the following command to download DivX codec:
Quote : wget http://download.divx.com/labs/divx611-20060201-gcc4.0.1.tar.gz

Untar DivX 6.1.1 codec for Linux:
Quote : tar -zxvf divx611-20060201-gcc4.0.1.tar.gz

Install divx611 codec:
Quote : cd divx611-20060201-gcc4.0.1
Quote : sudo ./install.sh

Press Q after reading agreement, please type yes to install codes.
Install vlc player

The VLC media player can be installed using apt-get command, type:
Quote : sudo apt-get vlc

How do I play files?

Open VLC player by Visiting Applications > Sound and Video > VLC Player. You can also open terminal and type the command:

Quote : vlc /path/to/my-downloaded-movie.avi

Enjoy ubuntu... ;)