/usr/lib/x86_64-linux-gnu/scotch-int32/libptscotchparmetis.so is in libptscotch-dev 6.0.4.dfsg1-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/scotch-int32/libptscotchparmetis-6.so