/usr/lib/x86_64-linux-gnu/libcourier-unicode.so is in libcourier-unicode-dev 1.4-3+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcourier-unicode.so.3.0.0
/usr/lib/x86_64-linux-gnu/libcourier-unicode.so.3.0.0