3.13.0-34.60) is not available, but a newer one is (3.13.0-166.216). We redirected you there.
/usr/src/linux-headers-3.13.0-144-lowlatency/arch/x86/net is in linux-headers-3.13.0-144-lowlatency 3.13.0-144.193.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-3.13.0-144-lowlatency/arch/x86/../../../linux-headers-3.13.0-144/arch/x86/net