3.13.0-30.55) is not available, but a newer one is (3.13.0-166.216). We redirected you there.
/usr/lib/linux-tools/3.19.0-80-generic/cpupower is in linux-tools-3.19.0-80-generic 3.19.0-80.88~14.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/3.19.0-80-generic/../../linux-lts-vivid-tools-3.19.0-80/cpupower