/usr/share/doc/libflint-dev/changelog.Debian.gz is in libflint-dev 2.5.2-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libflint-dev/../libflint-2.5.2/changelog.Debian.gz
/usr/share/doc/libflint-dev/../libflint-2.5.2/changelog.Debian.gz