"Debian Lenny doesn't come with FrostWire included in its repositories, but installing it is very easy if you follow the steps below.
"1. Download the DEB package
First, grab the DEB package from the official website and save it to a location on your hard disk. It is the same package for both Debian and Ubuntu.
"2. Enable non-free repositories
If those are not enabled yet, use your favourite text editor to edit the /etc/apt/sources.list file as root:"