Apt-get :: apt-get install doesn't get dependencies

I downloaded dsl-dpgk.unc, tweeked sources.list til the cows came home and ran apt-get update more times than I can count and still if I try to install anything with apt-get install it tells me the application depends on something but it isn't going to be installed.

How do I get apt-get install to download the requested app and all its dependencies?

apt-get update worked for me...


original here.