/usr/lib/x86_64-linux-gnu/libmudflap.so.0 is in libmudflap0 4.6.3-1ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmudflap.so.0.0.0
/usr/lib/x86_64-linux-gnu/libmudflap.so.0.0.0