/usr/lib/python2.7/dist-packages/loggerhead/controllers/atom_ui.py is in loggerhead 1.19~bzr479+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/loggerhead/controllers/../../../../../share/pyshared/loggerhead/controllers/atom_ui.py