Add to /etc/apt/sources.list:
deb http://ppa.launchpad.net/raph/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/raph/ppa/ubuntu jaunty main
To add the signature to apt:
sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 8097370C
Full details here.