THIS WILL DELETE EVERYTHING FROM YOUR CHROMEBOOK.
If you want to do more with your Chromebook and install Ubuntu Linux on it, this tutorial should get you going.
You’ll need to enable developer mode in order to do this, but once that is done, you only have to enter a couple of commands to get Ubuntu installed on your Chromebook.
You may be limited on what you can install if you have an ARM processor, but you can still follow along and complete the installation.
THIS WILL DELETE EVERYTHING FROM YOUR CHROMEBOOK.
You can read more about Crouton on Github:
https://github.com/dnschneid/crouton
Crouton Download Link:
https://goo.gl/fd3zc
The command you’ll need to enter to begin the install when you are ready is:
sudo sh ~/Downloads/crouton -e -t xfce
Once the install is complete, you’ll use this command to open Ubuntu:
sudo startxfce4
Cycle through Chromium OS and your running graphical chroots using Ctrl+Alt+Shift+Back and Ctrl+Alt+Shift+Forward.