If you have Kubuntu, you're in luck! Amarok comes standard with Kubuntu, it's already installed!!!
Installing on other Ubuntu variants
To install on other Ubuntu variants, find Amarok in the Software Centre or use the following command:
sudo apt-get install amarok
Packages for the release of Amarok 2.7 are available for Kubuntu 12.10 and Raring. Run the following commands:
sudo add-apt-repository ppa:kubuntu-ppa/backports sudo apt-get update sudo apt-get upgrade
VLC and GStreamer are all available as Phonon backends in Kubuntu. The GStreamer backend is installed by default. For more on Phonon, please see the http://community.kde.org/Phonon page. If you want to try VLC you can install
sudo aptitude install phonon-backend-vlc