/usr/lib/x86_64-linux-gnu/libAtlas-0.6.so.2 is in libatlas-cpp-0.6-2 0.6.3-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libAtlas-0.6.so.2.0.0
/usr/lib/x86_64-linux-gnu/libAtlas-0.6.so.2.0.0