/usr/lib/x86_64-linux-gnu/libyaml-cpp.so is in libyaml-cpp-dev 0.5.2-4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5
/usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5