/usr/lib/x86_64-linux-gnu/libowncloudsync.so.0 is in libowncloudsync0 1.5.0+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libowncloudsync.so.1.5.0
/usr/lib/x86_64-linux-gnu/libowncloudsync.so.1.5.0