/usr/lib/x86_64-linux-gnu/libcaca.so is in libcaca-dev 0.99.beta19-2ubuntu0.16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcaca.so.0.99.19
/usr/lib/x86_64-linux-gnu/libcaca.so.0.99.19