/usr/lib/linux-tools/3.13.0-142-generic/x86_energy_perf_policy is in linux-tools-3.13.0-142-generic 3.13.0-142.191.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/3.13.0-142-generic/../../linux-tools-3.13.0-142/x86_energy_perf_policy