/lib/x86_64-linux-gnu/libnss_compat.so.2 is in libc6 2.27-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libnss_compat-2.27.so
/lib/x86_64-linux-gnu/libnss_compat-2.27.so