Here is a guide that will show you how to install the medibuntu files and the ubuntu restricted extra packages on Ubuntu 12.10. You will need to install these files and packages for playing various audio/video types when using Ubuntu.
To install the medibuntu files you first need to add the medibuntu repository and keyring. To do this open a terminal window (press Ctrl+Alt+T) and copy+paste the following line:
sudo -E 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
To report bugs and/or crashes (optional) copy+paste the following line:
sudo apt-get install app-install-data-medibuntu apport-hooks-medibuntu
To install the Ubuntu restricted extras copy+paste the following line:
sudo apt-get install ubuntu-restricted-extras
During the installation you be notified about the TreuType core fonts for the Web EULA, select the
When the Medibuntu and Ubuntu restricted extras are install you can close the terminal window.