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Quick answer

To run 32-bit programs on 64-bit installations of Ubuntu, install the package ia32-libs:

markus@ubuntu:~$ sudo apt-get install ia32-libs

Long story

I wrote this article to expand your knowledge and understanding of how Linux works. This knowledge should increase your problem solving skills and speed in the area of server administration and command line use. I show how I adapted an installation shell script of a commercial software package, Flash^® Media Server, which was written for RedHat Linux, to work on 64-bit Ubuntu Linux. For every symptom that occurs in the process, I explain the problem behind it and how to fix it. The end result is available in Installing Flash^® Media Server on Ubuntu Linux.

This article is the first part in a series on the subject. In it I write about running 32 bit programs on 64 bit operating systems and the concept of shared libraries.
» Read more: About running 32 bit programs on 64 bit Ubuntu and shared libraries