/usr/lib/x86_64-linux-gnu/libvncclient.so is in libvncserver-dev 0.9.11+dfsg-1ubuntu1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libvncclient.so.1.0.0
/usr/lib/x86_64-linux-gnu/libvncclient.so.1.0.0