/usr/share/doc/libepubgen-dev/changelog.Debian.gz is in libepubgen-dev 0.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libepubgen-dev/../libepubgen-0.0-0/changelog.Debian.gz
/usr/share/doc/libepubgen-dev/../libepubgen-0.0-0/changelog.Debian.gz