Comment 10 for bug 137625

Me too i am not a python programmer :) So i'm afraid i won't be of much help for the technical details. Try following the advices in the related topic you find, and if you find the solution, could you explain it here ?
This problem shouldn't have occured after ubuntu upgrades, it seems like there is a wrong package dependency somewhere...

As long as we don't find the reasons and the solution on this problem, we can't act on it.