I used
add-apt-repository ppa:freeradius/stable
apt-get -y update upgrade

PS if it helps radtest user1 secret 192.168.0.93 1812 aaabbb works 
BUT Output received in response is TWO consecutive  rad_recv: Access-Accept packet FOllOWED by one radclient: received response to request we did not send

> Date: Mon, 27 May 2013 09:20:53 -0400
> From: aland@deployingradius.com
> To: freeradius-users@lists.freeradius.org
> Subject: Re: Testing failure during setup
>
> Elizabeth Fife wrote:
> > I am ready for an earbending likely from Alan but for the record I have
> > read the debug and done as much searching as my brain can handle before
> > this post
>
> You'll not that I get cranky when people *don't* follow instructions.
> You have followed them. So clearly you're a wonderful person.
>
> > I have the added each machine as a client of the other for testing in
> > clients.conf they both have the shared secret aaabbb
>
> Which should work.
>
> In short, the server gets an Access-Request and processes it. The
> client doesn't like the reply.
>
> Both Access-Request and Access-Challenge contain
> Message-Authenticator. The server processes the Access-Request *only*
> when the Message-Authenticator is correct. Which in turn depends on the
> shared secret.
>
> So the shared secret is the same on both ends.
>
> But, the client doesn't like the reply from the server. Which has a
> Message-Authenticator created using the same secret.
>
> I'm not really sure what to suggest here. This kind of thing should
> *never* happen.
>
> Did you install both servers from apt-get?
>
> Alan DeKok.
> -
> List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html