/usr/share/doc/gfxboot-dev/changelog.Debian.gz is in gfxboot-dev 4.5.2-1.1-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gfxboot-dev/../gfxboot/changelog.Debian.gz
/usr/share/doc/gfxboot-dev/../gfxboot/changelog.Debian.gz