/usr/lib/x86_64-linux-gnu/libUil.so.3 is in libuil4 2.3.8-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libUil.so.4.0.4
/usr/lib/x86_64-linux-gnu/libUil.so.4.0.4