/usr/lib/scotch-int32/libscotchmetis.so is in libscotch-dev 5.1.12b.dfsg-2.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/scotch-int32/libscotchmetis-5.1.so
/usr/lib/scotch-int32/libscotchmetis-5.1.so