/usr/lib/x86_64-linux-gnu/libMagickCore-6.Q16.so is in libmagickcore-6.q16-dev 8:6.8.9.9-7ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libMagickCore-6.Q16.so.2.0.0