Installing Crouton to enable Ubuntu
https://github.com/dnschneid/crouton
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Enable Developer Mode:
This will wipe your Chromebook C720 and erase everything on it that you have not backed up off of it.
Plug in power cable
Esc+Refresh then hold down Power button.
Ctrl+D then Enter to convert chromebook C720 to Developer Mode
From now on, at boot you can hit Ctrl+D to boot faster.
To UNDO developer Mode, when booting, hit space option to reset your chromebook to original.

Download crouton from here: https://github.com/dnschneid/crouton

Open a shell: Ctrl+Alt+T then type "shell" and hit Enter

Show help options:
sh ~/Downloads/crouton

List all release options:
sh ~/Downloads/crouton -r list

Show targets available:
sh ~/Downloads/crouton -t help

Enter new chroot:
sudo enter-chroot

Cycle from Chromium OS to/from chroots:
Intel
Ctrl+Alt+Back
Ctrl+Alt+Forward
Ctrl+Alt+Refresh
ARM
Ctrl+Alt+Shift+Back
Ctrl+Alt+Shift+Forward

To close the chroot Linux desktop, logout of Ubuntu

Notes:
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Downloads folder is shared between Chromium and Ubuntu environments

Check for updates, download the latest version, and see what's new by running from the chroot:
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croutonversion -u -d -c
Help:
croutonversion -h

Updating crouton
Exit the chroot and run sudo:
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sh ~/Downloads/crouton -u -n chrootname
Example:
sh ~/Downloads/crouton -u -n unity
It will update all installed targets.
You can use this with -e to encrypt a non-encrypted chroot, but make sure you don't interrupt the operation.


Target install options:
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2014 install:
---
unity trusty tahr (Ubuntu 14.04.1 LTS)
sudo sh -e ~/Downloads/crouton -t chrome,unity -r trusty -e
sudo startunity

Other options:
---
Gnome
sudo sh -e ~/Downloads/crouton -t chrome,gnome -r trusty -e
sudo startgnome

xfce
sudo sh -e ~/Downloads/crouton -t xfce
sudo enter-chroot startxfce4
 or
sudo startxfce4

unity
sudo sh -e ~/Downloads/crouton -t unity
sudo enter-chroot startunity
 or
sudo startunity

Extras:
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Unity:
sudo apt-get install gnome-terminal file-roller gedit
sudo apt-get install bash-completion vlc ubuntu-restricted-extras ttf-ubuntu-font-family software-center
sudo apt-get install libreoffice libreoffice-gtk
sudo apt-get install qpdfview
If needed:
sudo apt-get install synaptic

Xfce:
sudo apt-get install leafpad audacious


To Delete a chroot:
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sudo delete-chroot evilchroot
or
sudo delete-chroot *
It's actually just a shortcut to sudo edit-chroot -d evilchroot, which I suppose makes it a bit of a deceptive swiss-army-knife friend...still good?
sudo rm -rf /usr/local/bin