/usr/share/doc/libglobus-gass-cache-dbg/changelog.Debian.gz is in libglobus-gass-cache-dbg 8.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libglobus-gass-cache-dbg/../libglobus-gass-cache5/changelog.Debian.gz