Add the Medibuntu repository

Below are the instructions to add the Medibuntu repository to your system's list of APT repositories. These are commands that should be run in the Terminal (Applications -> Accessories -> Terminal).

If you are new to Ubuntu, please see https://help.ubuntu.com/community/Repositories/Ubuntu for an overview of repositories.

Add Medibuntu to your sources.list, as well as its GPG key to your keyring. Make sure to use the correct sources.list that corresponds to your current distribution.

• Ubuntu 9.04 "Jaunty Jackalope":

  sudo wget http://www.medibuntu.org/sources.list.d/jaunty.list --output-document=/etc/apt/sources.list.d/medibuntu.list

• Ubuntu 8.10 "Intrepid Ibex":

  sudo wget http://www.medibuntu.org/sources.list.d/intrepid.list --output-document=/etc/apt/sources.list.d/medibuntu.list

• Ubuntu 8.04 "Hardy Heron":

  sudo wget http://www.medibuntu.org/sources.list.d/hardy.list --output-document=/etc/apt/sources.list.d/medibuntu.list

• Ubuntu 7.10 "Gutsy Gibbon":

  sudo wget http://www.medibuntu.org/sources.list.d/gutsy.list --output-document=/etc/apt/sources.list.d/medibuntu.list

• Ubuntu 6.06 "Dapper Drake":

  sudo wget http://www.medibuntu.org/sources.list.d/dapper.list --output-document=/etc/apt/sources.list.d/medibuntu.list

Then, add the GPG Key:

sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update

You may be asked to accept this package even though it cannot be authenticated. This is normal; typing "Yes" means you trust Medibuntu.

Source: https://help.ubuntu.com/community/Medibuntu