/usr/lib/x86_64-linux-gnu/libstarpumpi-1.2.so is in libstarpu-dev 1.2.0+dfsg-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libstarpumpi-1.2.so.0.0.0
/usr/lib/x86_64-linux-gnu/libstarpumpi-1.2.so.0.0.0