/usr/share/doc/libgkeyfile-cil-dev/changelog.Debian.gz is in libgkeyfile-cil-dev 0.1-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgkeyfile-cil-dev/../libgkeyfile1.0-cil/changelog.Debian.gz