Have you ever installed a full desktop Linux system on your Chromebook? It isn’t all the hard, but it is a bit more complex than it should be. New features in the latest version of Chrome OS will make dipping into an alternative operating system easier. For example, you’ll be able to easily boot a full Linux system from a USB drive and use it without any additional hassle!
To install or boot a custom Linux environment right now, you’ll need to enable developer mode, open the Crosh shell, and type the appropriate commands to download and run the third-party scripts that will install Linux for you. All enabling developer mode does is give you access to the system files. “Developer mode” was literally a physical switch on the original Chromebooks, and flipping that switch just let you modify the system files.
No more. Enable “Developer mode” on current development versions of Chrome OS and you’ll get a few new options, courtesy of some recent additions.
USB and SSH
Source:
http://www.pcworld.com/article/2873561/google-just-made-it-easier-to-run-linux-on-your-chromebook.html