/usr/lib/x86_64-linux-gnu/libck.so is in libck-dev 0.4.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libck.so.0.4.4
/usr/lib/x86_64-linux-gnu/libck.so.0.4.4