/usr/share/doc/graphviz/changelog.Debian.gz is in graphviz 2.36.0-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/graphviz/../libcdt5/changelog.Debian.gz
/usr/share/doc/graphviz/../libcdt5/changelog.Debian.gz