Sometimes when you download a .deb(Debian Package file) of an package that you would like to install it will give you the “dependencies not met” error. This could happen when you use dpkg, Gdebi Package Manager or apt.

The solution to this is make sure that the version of the package you downloading is the newest version you can find. If this is the case then run this command:

sudo apt-get -f install

This will force apt to fix the broken dependencies.

Fonte: http://undiff.com/2008/08/deb-dpkg-unmet-dependencies-and-how-to-fix-this/