/usr/lib/x86_64-linux-gnu/libform.so is in libncurses5-dev 5.9+20140913-1+deb8u3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libform.so.5
/usr/lib/x86_64-linux-gnu/libform.so.5