/usr/powerpc64le-linux-gnu/lib/debug/libstdc++.so is in libstdc++6-4.8-dbg-ppc64el-cross 4.8.2-16ubuntu4cross0.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc64le-linux-gnu/lib/debug/libstdc++.so.6.0.19