Many of you already know about this, but since there are many users who are upgrading from Ubuntu 12.04 to 14.04, they might not be aware of what they need to do when a package, like Google Earth, fails to install because it depends on ia32-libs (on Ubuntu 64bit).
The ia32-libs package is no longer available in Ubuntu, starting with Ubuntu 13.10. The package was superseded by multiarch support so you don't need it any more, but some 64bit packages (which are actually 32bit applications) still depend on this package and because of this, they can't be installed in Ubuntu 14.04 or 13.10, 64bit.
Here's an example. Let's say you've downloaded the Google Earth 64bit package and want to install it in Ubuntu 14.04 (Trusty Tahr) 64bit via dpkg. Here's what happens: