/usr/share/doc/libdconf-dbus-1-dbg/changelog.Debian.gz is in libdconf-dbus-1-dbg 0.12.0-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdconf-dbus-1-dbg/../libdconf0/changelog.Debian.gz