/usr/share/doc/ubuntu-html5-theme-examples/changelog.Debian.gz is in ubuntu-html5-theme-examples 0.1.2+14.04.20140404-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ubuntu-html5-theme-examples/../ubuntu-html5-ui-toolkit/changelog.Debian.gz