- Add Multimedia support in Ubuntu 10.04 LTS (Lucid Lynx)

Ubuntu 10.04 LTS (Lucid Lynx) cannot include support for MP3 or DVD video playback or recording. MP3 formats are patented, and the patent holders have not provided the necessary licenses. Ubuntu 10.04 LTS (Lucid Lynx) also excludes other multimedia software due to patent, copyright, or license restrictions, such as Adobe Flash Player and RealNetworks RealPlayer.
That doesn’t mean you can’t play .mp3 files in Ubuntu 10.04 LTS (Lucid Lynx), it just takes a bit of work (not much).

Follow these instructions to get mp3 and other multimedia support on your Ubuntu 10.04 LTS (Lucid Lynx).

$ sudo wget --output-document=/etc/apt/sources.list.d/medibuntu.list http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list
$ sudo apt-get --quiet update
$ sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring
$ sudo apt-get --quiet update

After adding the repositories, install the codecs:
Install non-free-codecs:

$ sudo apt-get install non-free-codecs

Install DVD Support by using following command:

$ sudo apt-get install libdvdcss2

Windows codecs:

sudo apt-get install w32codecs

VLC player and Mplayer:

$ sudo apt-get install vlc mplayer

Adobe Acrobat Reader

$sudo apt-get install acroread acroread-plugins

source:http://linuxpoison.blogspot.com/2010/05/135781677511700.html