Unable to get program listings watch TV on Mythbuntu 10.04
 

When I select the watch TV option I get the following error:
It also failed when I tried to do the channel scan during setup. I've tried plugging the aeriel into both ports on my Hauppage DVB TV card-it made no difference. The specific model is: Hauppauge WinTV Nova-TD 500 Dual digital DVB-T PCI TV Tuner card.

This is a clean install (front and backend) on a new machine and I've never tried setting up Mythbuntu before and as there are quite a lot of technical settings I may well have overlooked something but don't know what. Any advice would be appreciated.