/usr/src/linux-headers-4.2.0-21-generic/ is in linux-headers-4.2.0-21-generic 4.2.0-21.25~14.04.1.
This file is owned by root:root, with mode 0o755.
There are a lot of files here (9463 total).
We're only showing the immediate contents of /usr/src/linux-headers-4.2.0-21-generic
.