/usr/lib/x86_64-linux-gnu/libubuntuoneauth-2.0.so is in libubuntuoneauth-2.0-dev 15.11+16.04.20160323.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libubuntuoneauth-2.0.so.0