/usr/lib32/debug/libstdc++.so is in lib32stdc++6-4.9-dbg 4.9.3-13ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib32/debug/libstdc++.so.6.0.20
/usr/lib32/debug/libstdc++.so.6.0.20