freeradius -- How do I properly setup freeradius with mysql support and dialup-admin web interface?

Hi folks!  I'm currently working on replacing an existing freeradius server that handles user logins to a captive portal appliance.  I've decided to use Ubuntu Server 7.10 as the host OS, and it happens to have packages for freeradius, and the supporting LAMP services.  The version of freeradius that comes with Ubuntu 7.10 is listed as 1.1.6-2 in aptitude.  However, the project homepage lists a much newer version, 2.0.3

One of the issues I've come across during research is the fact that freeradius 1.1.6-2 appears to be reliant upon PHP4, whereas ubuntu is using PHP5, and I fear putting PHP4 onto the server will break all sorts of other things.  Does the 2.0.3 version support the newer PHP5?  How do I properly remove the existing freeradius and avoid config file conflicts?

Really I guess what I'm hoping for is to come across someone who has recently deployed a freeradius server, and has some pointers on a smooth configuration.  I'm comfortable following the guides and HOWTOs listed on the freeradius WIKI, yet it's when I run into problems during testing that I get a little stumped.

For instance, the dialup-admin web interface included with freeradius is currently showing SQL DEBUG errors and query statements at the top of most of the pages.  And, the add user or lookup user functions are not working at all.  Seems like the dialupadmin isn't using the MySQL service properly  (PHP problems?)

As always, if debug output or other command result output is desired, I can quickly provide that information (possibly with some reminders of the correct commands and syntax under Ubuntu)