watch video in ubuntu 9.04

1. Remove totem media player.

Remove totem media player from synaptic.
sudo rm /usr/share/applications/totem.desktop

2. Install mplayer, codec and plugin for firefox

sudo apt-get install mplayer mplayer-fonts mozilla-mplayer
download all-20071007.tar.bz2 from http://www2.mplayerhq.hu/MPlayer/releases/codecs/
tar jxvf all-20071007.tar.bz2 /usr/lib/codecs/

3. Fix realplayer codec: drvc.so

sudo apt-get install libstdc++5

4. Add restricted video format

sudo apt-get install ubuntu-restricted-extras

5. Also better to do the following:

sudo wget http://www.medibuntu.org/sources.list.d/jaunty.list --output-document=/etc/apt/sources.list.d/medibuntu.list
sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update
sudo apt-get install w32codecs

Enjoy now!