apt-cdrom add "gpgv: Can't check signature: public key not found"

[rpowersau at gmail.com]

Hi, 

When I try to use 'apt-cdrom add' with my hoary cd, I get the above
error. I've tried goggling it with no luck. Anybody know what this
means or how to fix it?

Thanks.
 
-- 
Regards,
Russ