/usr/lib/x86_64-linux-gnu/libowncloudsync.so.0 is in libowncloudsync0 2.1.1+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libowncloudsync.so.2.1.1
/usr/lib/x86_64-linux-gnu/libowncloudsync.so.2.1.1