/usr/lib/pyshared/python2.6/gtk-2.0/gtk/gtkgl/_gtkgl.so is in python-gtkglext1 1.1.0-9.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.6/gtk-2.0/gtk/gtkgl/../../../../../python2.6/dist-packages/gtk-2.0/gtk/gtkgl/_gtkgl.so