4.4.0-87.110) is not available, but a newer one is (4.4.0-142.168). We redirected you there.
/usr/lib/linux-tools/4.4.0-134-lowlatency/perf is in linux-tools-4.4.0-134-lowlatency 4.4.0-134.160~14.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.4.0-134-lowlatency/../../linux-lts-xenial-tools-4.4.0-134/perf