The version you requested (4.4.0-138.164) is not available, but a newer one is (4.4.0-142.168). We redirected you there.
This file is indexed.

/lib/modules/4.10.0-35-generic/kernel/fs/autofs4/ is in linux-image-extra-4.10.0-35-generic 4.10.0-35.39~16.04.1.

This file is owned by root:root, with mode 0o755.