/usr/lib/libsmumps_scotch.so is in libmumps-scotch-dev 4.9.2.dfsg-7build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libsmumps_scotch-4.9.2.so
/usr/lib/libsmumps_scotch-4.9.2.so