/usr/share/doc/libmimedir-dev/changelog.Debian.gz is in libmimedir-dev 0.5.1-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmimedir-dev/../libmimedir0/changelog.Debian.gz
/usr/share/doc/libmimedir-dev/../libmimedir0/changelog.Debian.gz