Build 32-bit on 64-bit Ubuntu: installing ia32-libs does not include libstdc++
Solution 1:
You need to install:
sudo apt-get install g++-multilib
Here are more details on Ubuntu wiki.
Solution 2:
Try installing this:
apt-get install lib32stdc++6
It installs this:
/usr/lib32/libstdc++.so.6
/usr/lib32/libstdc++.so.6.0.16