FreeRADIUS Version 2.1.0 documentation

Where can I find documentation and training material for Free Radius Version 2.10 FreeRADIUS Version 2.1.0, for host x86_64-pc-linux-gnu Ubuntu 9.04. This is the only version that is available from Synaptics Package manager The current version 2.18 does not work in Ubuntu. I tried building the Debina package as specified in http://wiki.freeradius.org/Build#Building_Debian_packages, but it did not work in Ubuntu 9.04. Or how does one get older versions - i.e. Freeradius 1.0? Configuration for the older versions appeared to be easier.