Two years in the making, the future of computer-managed music is here! Giving you a new way to interact with you music, the Amarok team have redesigned your favorite media play from the ground up to allow you to interact with your music in exciting, new ways only made possible by the technologies KDE4 has to offer.
You can read the details of the release here
Follow the Kubuntu Repository Guide to enable Recommended Updates (backports) and add the following to your 'Third-Party Software' tab:
You can now update an existing Amarok 2 installation to the most recent version using the Adept Updater tool in your system tray.
If you do not have an existing Amarok 2 install, please follow the Adept How to and install the package called "amarok-kde4".