how to setup ubuntu to play an Encrypted DVD

VLC media player for Debian GNU/Linux
Debian stable (lenny)

VLC is available in etch, with a quite old version. Install vlc, mozilla-plugin-vlc, the usual way you do it.
Debian testing (squeeze)

VLC is potentially available in testing. But due to the way testing works, we can't guarantee which version, if any, is currently available. Install vlc, mozilla-plugin-vlc, the usual way you do it.
Debian unstable (sid)

VLC's latest packaged version is always in the official Debian unstable branch. However you should still use our apt-get line if you need libdvdcss:

deb http://download.videolan.org/pub/videolan/debian sid main
deb-src http://download.videolan.org/pub/videolan/debian sid main

For a normal install, do:

# apt-get update
# apt-get install vlc libdvdcss2

Debian oldstable (etch)

A version (0.8.6) is packaged in Etch. However, if you want libdvdcss (DVD decryption) support, you will need to add the following lines to your /etc/apt/sources.list:

deb http://download.videolan.org/pub/videolan/debian sarge main
deb-src http://download.videolan.org/pub/videolan/debian sarge main

For a normal install, do:

# apt-get update
# apt-get install vlc libdvdcss2

google chromium browser setup.

sudo su
echo "deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main #chromium-browser" > /etc/apt/sources.list.d/chromium.list
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xfbef0d696de1c72ba5a835fe5a9bf3bb4e5e17b5
sudo apt-get update && sudo apt-get install chromium-browser

use command sudo dolphin to copy ".SO" files enable Flash support:
cd /usr/lib/chromium-browser/plugins


Note: this command may only copy A dead link...
sudo ln -s ../../flashplugin-installer/libflashplayer.so

For extensions: Start browser with the following commands.
chromium-browser --enable-greasemonkey --enable-user-scripts --enable-extensions

Note browser may lock out bash shell dir listing use:
/usr/lib/chromium-browser/extensions

browse to chrome://extensions/ to check installation and about:plugins..