/usr/lib/x86_64-linux-gnu/libICE.so is in libice-dev 2:1.0.9-1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libICE.so.6.3.0
/usr/lib/x86_64-linux-gnu/libICE.so.6.3.0