/usr/lib/linux-tools/4.4.0-142-lowlatency/cpupower is in linux-tools-4.4.0-142-lowlatency 4.4.0-142.168.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.4.0-142-lowlatency/../../linux-tools-4.4.0-142/cpupower