How to install Ubuntu on an Acer C710 Chromebook
To get Ubuntu running on your Acer C710 Chromebook you have the the choice between running it in a chroot environment next to the running Chrome OS or install it in a new partition and boot directly the Ubuntu kernel. I used the 2. option in the past but had some issues with drivers and updating the system. My recommendation is to use Install option 1.
Recovery # If you want to start fresh or your system does not boot anymore, follow the instructions at https://support.