/usr/arm-linux-gnueabi/libhf/libstdc++.so.6 is in libhfstdc++6-armel-cross 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/arm-linux-gnueabi/libhf/libstdc++.so.6.0.21
/usr/arm-linux-gnueabi/libhf/libstdc++.so.6.0.21