Ubuntu - Rythym Box issue

[Tom]

Hello to All:

I've installed Ubuntu 7.10 Gutsy and have tried Rythym box with some
disappointing results.  Many of the radio stations that I try to import
end up not playing w/ message "proper plug in not installed".  What do
I need to do to make R-Box more functional, or, do I need to replace it
w/ some other player w/ better plug-ins?

Thanks for your inputs,

Tom Lau