/usr/src/linux-headers-3.13.0-147-generic/arch/x86/um is in linux-headers-3.13.0-147-generic 3.13.0-147.196.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-3.13.0-147-generic/arch/x86/../../../linux-headers-3.13.0-147/arch/x86/um