Hmm, that's interesting... I've not tried to install Erminig on Diablo for the moment (I was planning to do so after my vacations...), but this seems a quite serious bug in Erminig

I will try to look at this if I can manage to reproduce the bug in scratchbox...

In the meantime I've opened a bug on Garage concerning this problem, so that I can keep track of it and don't forget it

By the way, what error did you get when you tried to install python-gdata?