/usr/share/doc/libqca-qt5-2-dbg/changelog.Debian.gz is in libqca-qt5-2-dbg 2.1.1-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libqca-qt5-2-dbg/../libqca-qt5-2/changelog.Debian.gz