/usr/src/linux-headers-4.15.0-1014-azure/Kbuild is in linux-headers-4.15.0-1014-azure 4.15.0-1014.14.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-4.15.0-1014-azure/../linux-azure-headers-4.15.0-1014/Kbuild