/usr/lib/x86_64-linux-gnu/libftdipp.so is in libftdipp-dev 0.20-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libftdipp.so.1.20.0
/usr/lib/x86_64-linux-gnu/libftdipp.so.1.20.0