/usr/src/linux-headers-3.16.0-69-generic/Kbuild is in linux-headers-3.16.0-69-generic 3.16.0-69.89~14.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-3.16.0-69-generic/../linux-headers-3.16.0-69/Kbuild