/lib/modules/3.19.0-41-generic/build is in linux-headers-3.19.0-41-generic 3.19.0-41.46~14.04.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-3.19.0-41-generic
/usr/src/linux-headers-3.19.0-41-generic