This file is indexed.

/lib/modules/4.2.0-36-lowlatency/build is in linux-headers-4.2.0-36-lowlatency 4.2.0-36.42~14.04.1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/src/linux-headers-4.2.0-36-lowlatency