/usr/lib/libstarpumpi-1.1.so is in libstarpu-dev 1.1.0+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libstarpumpi-1.1.so.2.0.2
/usr/lib/libstarpumpi-1.1.so.2.0.2