There have been some new people around who could not launch gerix. I found the same condition in my VM.

I found pyqt-tools needed to be installed to successfully launch.
Figured I'd offer the solution here so it could be updated in later revisions, though it doesnt matter much to me as I only work with aircrack directly and do not use GUIs for my wireless work.

Code:
apt-get install pyqt-tools