[ubuntu] Pitivi fails to start - "PyGTK couldn't be found!, No module named pygtk"

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http://ubuntuforums.org – Hi, It has been a while since I used Pitivi (6 months or more, in which time I've upgraded from 10.04 to 12.04 and other things too) but when I try to launch it I get the error... "PyGTK couldn't be found !", 'No module named pygtk' I've tried some of the more obvious things like reinstalling python-gtk2 and pitivi... > sudo apt-get install --reinstall python-gtk2 > sudo apt-get install --reinstall pitivi but still the same error message. Anyone have any ideas on what I should try next? Thanks! (Hardware)