/usr/lib/python2.7/dist-packages/flask_autoindex/templates/__autoindex__/autoindex.html is in python-flask-autoindex 0.6+0git20160725-02b454-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/flask_autoindex/templates/__autoindex__/../../../../../../share/python-flask-autoindex/templates/__autoindex__/autoindex.html