/usr/share/doc/libmsn-dev/changelog.Debian.gz is in libmsn-dev 4.2.1-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmsn-dev/../libmsn0.3/changelog.Debian.gz
/usr/share/doc/libmsn-dev/../libmsn0.3/changelog.Debian.gz