/usr/lib/scotch-int32/libptscotcherr.so is in libptscotch-dev 5.1.12b.dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/scotch-int32/libptscotcherr-5.1.so
/usr/lib/scotch-int32/libptscotcherr-5.1.so