/usr/lib/x86_64-linux-gnu/libmission-control-plugins.so is in libmission-control-plugins-dev 1:5.16.3-1ubuntu6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmission-control-plugins.so.0.5.1