/usr/libx32/libatomic.so.1 is in libx32atomic1 4.8.4-2ubuntu1~14.04.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/libx32/libatomic.so.1.0.0
/usr/libx32/libatomic.so.1.0.0