/usr/lib/x86_64-linux-gnu/amanda/libndmjob.so is in amanda-common 1:3.5.1-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/amanda/libndmjob-3.5.1.so
/usr/lib/x86_64-linux-gnu/amanda/libndmjob-3.5.1.so