/usr/share/doc/libudunits2-dev/changelog.Debian.gz is in libudunits2-dev 2.2.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libudunits2-dev/../libudunits2-0/changelog.Debian.gz
/usr/share/doc/libudunits2-dev/../libudunits2-0/changelog.Debian.gz