/usr/share/doc/php-mockery/html/_static/fonts/Lato-Regular.ttf is in php-mockery-doc 1.0-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/php-mockery/html/_static/fonts/../../../../../sphinx_rtd_theme/static/fonts/Lato-Regular.ttf