/usr/lib/x86_64-linux-gnu/libyumancx.so is in libyuma-dev 2.9-1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libyumancx.so.2.0.0
/usr/lib/x86_64-linux-gnu/libyumancx.so.2.0.0