/usr/lib/x86_64-linux-gnu/root5.34/libX3d.so is in root-plugin-graf3d-x3d 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/root5.34/libX3d.so.5
/usr/lib/x86_64-linux-gnu/root5.34/libX3d.so.5