/usr/lib/x86_64-linux-gnu/libmx-gtk-1.0.so.0 is in libmx-1.0-2 1.4.7-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmx-gtk-1.0.so.0.0.0
/usr/lib/x86_64-linux-gnu/libmx-gtk-1.0.so.0.0.0