/usr/lib/x86_64-linux-gnu/libOxideQtQuick.so is in liboxideqtquick-dev 1.21.5-0ubuntu0.16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libOxideQtQuick.so.0
/usr/lib/x86_64-linux-gnu/libOxideQtQuick.so.0