nothing will play dvds
Due to idiotic DRM legal crap the stock debian based linux will only play region free DVDs out of the box. To fix it for Ubuntu:
sudo apt-get install totem-xine libxine1-ffmpeg libdvdread4
sudo /usr/share/doc/libdvdread4/install-css.sh
While at it, lets also install the official flash plugin:
sudo apt-get install flashplugin-installer
...and java:
sudo apt-get install sun-java6-plugin
These all work perfectly on both 32-bit and 64-bit Ubuntu.
Free bonus: Google Earth
sudo apt-get install googleearth-package
make-googleearth-package
sudo dpkg -i googleearth*.deb
(P.S. You might need to manually sudo apt-get install lib32nss-mdns and then sudo apt-get-f install .. But only if the googleearth deb doesn't install out of the box)