Hey all, this is actually really simple. The signing key is messed up so the Zentyal repository isn't verified. When you get to the point where the initial configuration says it's impossible just open up a console and run through the following 3 commands until it runs out of things to do. If the first doesn't work then just go on to the next, keep doing it like 3 or 4 times.
sudo apt-get update
sudo apt-get -f install
sudo apt-get -f upgrade
DON"T put any package name after install, it just knows what to do. You'll likely be prompted for installing the packages without verification, but it's legit. Everything else will NOT work, even trying installing packages individually won't cut it anymore. The problem is that when we install it manually from other repositories then stub files don't get made and Zentyal itself has no clue about what's doing what. Kind of frustrating but it worked like a champ for me!