Google Chrome is only available for Windows officially but there is a workaround which will allow you to run Chrome on a Linux flavor like Ubuntu.
Codeweavers have released a version of Google Chrome that will run on any Linux flavor as well as on a Mac, so if you have been using these OS and have been waiting for Google to officially launch a version, you can cut short the wait period and use the Crossover Chromium to run Google Chrome on a Linux or Mac.
Crossover Chromium: Google Chrome for Linux and Mac