/usr/share/doc/hud-tools/changelog.Debian.gz is in hud-tools 14.10+17.10.20170619-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/hud-tools/../libhud-client2/changelog.Debian.gz
/usr/share/doc/hud-tools/../libhud-client2/changelog.Debian.gz