/usr/lib/x86_64-linux-gnu/libqtdbustest.so is in libqtdbustest1-dev 0.2+16.04.20160216-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libqtdbustest.so.1
/usr/lib/x86_64-linux-gnu/libqtdbustest.so.1