/usr/lib/x86_64-linux-gnu/libnpth.so.0 is in libnpth0 1.5-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnpth.so.0.1.1
/usr/lib/x86_64-linux-gnu/libnpth.so.0.1.1