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