/usr/lib/pyshared/python2.7/gtk-2.0/bonobo/_bonobo.so is in python-gnome2 2.28.1+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/gtk-2.0/bonobo/../../../../python2.7/dist-packages/gtk-2.0/bonobo/_bonobo.so