How to Run 32-bit Apps in 64-bit Linux

"When running 32-bit programs in a 64-bit environment, Ubuntu still looks for the default GTK engines. This will cause you to receive an error such as this: “wrong ELF class”. This type of error can be particularly annoying in applications like Chromium, the new open source version of the Google Chrome browser.

"Ubuntu does actually install the default 32-bit version of the GTK engines in /usr/lib32/gtk-2.0, but what I discovered in my case was that GTK themes like the one I was using, qtcurve, were not found in this directory. The result was really ugly GTK programs.

"The quick solution was to do the following:"

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