/usr/x86_64-linux-gnux32/lib64/libnss_nisplus.so.2 is in libc6-amd64-x32-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/x86_64-linux-gnux32/lib64/libnss_nisplus-2.27.so
/usr/x86_64-linux-gnux32/lib64/libnss_nisplus-2.27.so