/usr/lib/x86_64-linux-gnu/libfosfat.so.0 is in libfosfat0 0.4.0-13-ged091bb-1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfosfat.so.0.4.0
/usr/lib/x86_64-linux-gnu/libfosfat.so.0.4.0