Install VLC unstable on Ubuntu 10.04

sudo add-apt-repository ppa:c-korn/vlc
sudo apt-get update
sudo apt-get install vlc

Back to the stable version:

sudo ppa-purge ppa:c-korn/vlc
sudo apt-get remove --purge vlc vlc-nox vlc-data vlc-plugin-pulse
sudo apt-get update
sudo apt-get install vlc