~ $ mypaint external python-simplejson Traceback (most recent call last): File "/opt/mypaint/bin/mypaint", line 171, in <module> from gui import main File "/opt/mypaint/share/mypaint/gui/main.py", line 13, in <module> assert gtk.ver >= required, 'You need to upgrade PyGTK, at least version %d.%d.%d is required.' % required AssertionError: You need to upgrade PyGTK, at least version 2.16.0 is required. ~ $