/usr/lib/libmrpt-reactivenav.so.1.0 is in libmrpt-reactivenav1.0 1:1.0.2-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmrpt-reactivenav.so.1.0.2
/usr/lib/libmrpt-reactivenav.so.1.0.2