/usr/share/doc/libc6-dev/changelog.Debian.gz is in libc6-dev 2.23-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libc6-dev/../libc6/changelog.Debian.gz
/usr/share/doc/libc6-dev/../libc6/changelog.Debian.gz