/usr/share/doc/gfs-pcmk/changelog.Debian.gz is in gfs-pcmk 3.1.3-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gfs-pcmk/../gfs2-cluster/changelog.Debian.gz
/usr/share/doc/gfs-pcmk/../gfs2-cluster/changelog.Debian.gz