/usr/lib/x86_64-linux-gnu/libumockdev.so.0 is in libumockdev0 0.8.11-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libumockdev.so.0.3.0
/usr/lib/x86_64-linux-gnu/libumockdev.so.0.3.0