Ubuntu12.04安装ia32-libs

sudo apt-get install libc6:i386
sudo -i
cd /etc/apt/sources.list.d
// care for old-releases.ubuntu.com
echo "deb http://old-releases.ubuntu.com/ubuntu/ raring main restricted universe multiverse" >ia32-libs-raring.list
apt-get update
apt-get install ia32-libs
rm /etc/apt/sources.list.d/ia32-libs-raring.list
apt-get update
exit
sudo apt-get install gcc-multilib

tip : if still not work 

you need to change your source  , then try above again .

http://blog.sina.com.cn/s/blog_6c41c7510101bilw.html