/usr/share/doc/gambas3-gb-compress-zlib/changelog.Debian.gz is in gambas3-gb-compress-zlib 3.1.1-2.2ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gambas3-gb-compress-zlib/../gambas3-runtime/changelog.Debian.gz