/usr/mips64-linux-gnuabi64/lib32/debug/libstdc++.so is in libn32stdc++6-5-dbg-mips64-cross 5.5.0-12ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mips64-linux-gnuabi64/lib32/debug/libstdc++.so.6.0.21