/usr/powerpc-linux-gnu/lib64/libc.so.6 is in libc6-ppc64-powerpc-cross 2.23-0ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc-linux-gnu/lib64/libc-2.23.so
/usr/powerpc-linux-gnu/lib64/libc-2.23.so