/usr/lib/x86_64-linux-gnu/libcaribou.so is in libcaribou-dev 0.4.20-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcaribou.so.0.0.0
/usr/lib/x86_64-linux-gnu/libcaribou.so.0.0.0