/usr/share/doc/python-openssl-doc/html/_static/fonts/Lato-Bold.ttf is in python-openssl-doc 17.5.0-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-openssl-doc/html/_static/fonts/../../../../../sphinx_rtd_theme/static/fonts/Lato-Bold.ttf