/usr/lib/libdmumps_scotch.so is in libmumps-scotch-dev 4.10.0.dfsg-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libdmumps_scotch-4.10.0.so
/usr/lib/libdmumps_scotch-4.10.0.so