/usr/lib/python2.7/dist-packages/gtk-2.0/ethos/ui.py is in python-ethos 0.2.2-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/gtk-2.0/ethos/../../../../../share/pyshared/gtk-2.0/ethos/ui.py