/usr/lib/x86_64-linux-gnu/libctk.so is in libgofigure-dev 0.9.0-3+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libctk.so.0.9
/usr/lib/x86_64-linux-gnu/libctk.so.0.9