/usr/lib/libgksu2.so.0 is in libgksu2-0 2.0.13~pre1-9+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libgksu2.so.0.0.2
/usr/lib/libgksu2.so.0.0.2