The issue I've run into is that "libqtgui4" is a dependency for "libqt4-declarative", but "libqt4-declarative" is also a dependency for "libqtgui4".
Why are they both dependent on each other, so that neither can install?
This is fine for dpkg. You install all the debs that are interesting even though you get dependency errors, and then apt will install them all once you've tried to install all the packages necessary to satisfy the dependencies, with apt-get -f install