It was not only Mac OS X Snow Leopard and Windows 7 hacked on running Google Chrome , but Ubuntu was also made running on Cr-48. In the mid of Dec. 2010, a page on the Chromium Projects website posted details on how to install Ubuntu on a Cr-48 netbook.
The process is actually very easy. You have to hack at the SSD’s filesystem a little and fiddle with the Chrome OS kernel, but if you do everything right, you should be rewarded with a dual-boot system capable of running both Ubuntu and Chrome OS.
The best bit, though, is that you have to enable ‘developer mode‘ to escape Chrome OS’s ‘verified boot‘ security measure. To do this, you need to flip a switch on the back, under the battery, as per the hilarious instructional photo shown after the break.
Full Guide:How to boot Ubuntu on a Cr-48