This file is indexed.

/lib/modules/4.10.0-28-lowlatency/build is in linux-headers-4.10.0-28-lowlatency 4.10.0-28.32~16.04.2.

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

It is a symlink to /usr/src/linux-headers-4.10.0-28-lowlatency