/usr/lib/x86_64-linux-gnu/libffi.so.6

This file is indexed.

/usr/lib/x86_64-linux-gnu/libffi.so.6 is in libffi6 3.0.11~rc1-5.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libffi.so.6.0.0