/usr/lib/x86_64-linux-gnu/libmypaint-1.3.so.0 is in libmypaint-1.3-0 1.3.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmypaint-1.3.so.0.0.0
/usr/lib/x86_64-linux-gnu/libmypaint-1.3.so.0.0.0