/usr/lib/x86_64-linux-gnu/libyaml.so is in libyaml-dev 0.1.4-3ubuntu3.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.2
/usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.2