/usr/lib/x86_64-linux-gnu/libcdk.so.5 is in libcdk5 5.0.20161210-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcdk.so.5.0
/usr/lib/x86_64-linux-gnu/libcdk.so.5.0