An article written by PC Format, published in tecradar magazine describes the steps for installing GNU/Linux operating system in Chrome book.
For the type of user Chromebooks are generally aimed at, it does exactly what it needs to do. It's fast and easy to use - what more could you ask for? Well, you may find yourself missing some of the features associated with more traditional operating systems.
Don't worry, help is at hand, in the form of Crouton. Crouton is a set of programs that create a chroot environment within Chrome OS, from which you can run a Linux OS, with Debian and Ubuntu currently supported.A chroot is not the same as a virtual machine - you're still running on the standard OS, but within a new environment. This has several advantages. It doesn't touch the existing OS installation, making reversal easy; it uses the Chrome OS drivers, so there are no compatibility issues; and it's written by the Chrome