/usr/share/doc/libdpkg-perl/changelog.Debian.gz is in libdpkg-perl 1.18.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdpkg-perl/../dpkg/changelog.Debian.gz
/usr/share/doc/libdpkg-perl/../dpkg/changelog.Debian.gz