/usr/lib/atlas-base/liblapack_atlas.so.3gf is in libatlas3gf-base 3.8.4-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/atlas-base/liblapack_atlas.so.3gf.0
/usr/lib/atlas-base/liblapack_atlas.so.3gf.0