Medibuntu: non-free-codecs for gutsy

Just add Medibuntu repository to your sources.list:

# Medibuntu.
deb http://packages.medibuntu.org/ gutsy free non-free 

Open the terminal

wget -q http://packages.medibuntu.org/medibuntu-key.gpg -O- | sudo apt-key add - && sudo apt-get update
sudo apt-get install non-free-codecs

Note:

Other packages are:

Skype

w32codecs

w64codecs

How to install Avant windows Navigator in Ubuntu Gusty Through repository

First, edit your apt sources: gksudo gedit /etc/apt/sources.list

Add these lines to the bottom:

## Avant Window Navigator
deb http://download.tuxfamily.org/syzygy42/ gutsy avant-window-navigator
deb-src http://download.tuxfamily.org/syzygy42/ gutsy avant-window-navigator

Then do this in a terminal:

wget http://download.tuxfamily.org/syzygy42/reacocard.asc -O- | sudo apt-key add –
sudo apt-get update
sudo apt-get upgrade

Now to install the stable AWN version do

NOTICE: No stable AWN at this time. It will be added at the next release

For AWN BZR do:

sudo apt-get install avant-window-navigator-bzr

You can install more applets for AWN by doing:

sudo apt-get install awn-core-applets-bzr