/usr/share/doc/erlang-gs/changelog.Debian.gz is in erlang-gs 1:18.3-dfsg-1ubuntu3.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/erlang-gs/../erlang-base/changelog.Debian.gz
/usr/share/doc/erlang-gs/../erlang-base/changelog.Debian.gz