/usr/lib/x86_64-linux-gnu/libicui18n.so is in libicu-dev 52.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libicui18n.so.52.1
/usr/lib/x86_64-linux-gnu/libicui18n.so.52.1