My wvdial.conf is empty, tried editing in a terminal window with "sudo" but was
not able, probably using wrong syntax or something. How do I edit a file as
sudo?

The program downloaded packages fine when first installed but now won't. The
parameters, phone number, user, etc were saved but if they aren't in wvdial.conf
where would they be? What changed when I ran UBUNTU the 2nd time and why?