Although I am not sure, I think the AMD64 release of Ubuntu is a pure 64 bit distribution, and does not have the 32 bit libraries required to run i386 packages natively. You may be able to find a package containing 32 bit libraries for your system, just search the package repositories.
Check this guide -
https://alioth.debian.org/docman/vie...d64-howto.html
The part which you are interested in is "Using an IA32 chroot to run 32bit applications".