/usr/lib/python2.6/dist-packages/mastertickets/web_ui.py is in trac-mastertickets 3.0.2+20111224-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/mastertickets/../../../../share/pyshared/mastertickets/web_ui.py