installing Mythtv 0.21

[Mike McMullin]

On Sun, 2009-12-20 at 21:59 -0500, Mike McMullin wrote:
> I did an update of my laptop to Karmic Koala, and got the new version
> of mythtv 0.22, but the backend is 0.21 and the frontend will not
> connect to the backend. 
> 
>   Can I use synaptic to install 0.21, or how can I get 0.21 on the
> updated system?

  I should note here that the backend is on a different system.