/usr/share/doc/ubuntu-packaging-guide-html-de/_static/ajax-loader.gif is in ubuntu-packaging-guide-html-de 0.3.7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ubuntu-packaging-guide-html-de/_static/../../../ubuntu-packaging-guide/_static/ajax-loader.gif