/usr/lib/x86_64-linux-gnu/liballegro_memfile.so.5.0 is in liballegro5.0 2:5.0.11-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liballegro_memfile.so.5.0.11
/usr/lib/x86_64-linux-gnu/liballegro_memfile.so.5.0.11