/usr/lib/libblas/libblas.so.3gf is in libblas3gf 1.2.20110419-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libblas/libblas.so.3gf.0
/usr/lib/libblas/libblas.so.3gf.0