/usr/share/doc/kdoctools5-dbg/changelog.Debian.gz is in kdoctools5-dbg 5.18.0-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/kdoctools5-dbg/../kdoctools5/changelog.Debian.gz
/usr/share/doc/kdoctools5-dbg/../kdoctools5/changelog.Debian.gz