How to install Google Earth on Ubuntu 11.10?
You can install it from this website. Remember that Google Earth is a "windows ported" application, so it have some bugs.
Installing the deb found on the official page is sufficient, I just checked.
But some very precise functionalities may not function well, if I remember. Something like opening a location in Google Maps in your browser may not work. Google is working on it.
According to the Webupd8 website, you may also need to install the msttcorefonts package to get better font rendering.