/usr/lib/x86_64-linux-gnu/libkasten3okteta1gui.so.1 is in libkasten3okteta1gui1 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libkasten3okteta1gui.so.0.3.1