/usr/lib/x86_64-linux-gnu/libcroco-0.6.so is in libcroco3-dev 0.6.11-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libcroco-0.6.so.3.0.1
/usr/lib/x86_64-linux-gnu/libcroco-0.6.so.3.0.1