/usr/lib/x86_64-linux-gnu/libgazebo.so.9 is in libgazebo9 9.0.0+dfsg5-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgazebo.so.9.0.0
/usr/lib/x86_64-linux-gnu/libgazebo.so.9.0.0