After, it will show the screen with the Red Exclamation point again.It will also wipe your local info, like the files, documents, or pics you downloaded. This process might take a little while, about 10-15 minutes. It will pop-up a new screen, then reboot and enable Developer Mode. After pressing enter, give it some time.After doing so (pressing Ctrl+D), It will ask you if you really wanna go into developer mode.When the Recovery Mode screen pops up- the screen with the yellow exclamation point -just simply press Ctrl+D.Now, these key combinations will reboot your Chromebook into recovery mode. Press and hold the esc button and the refresh button, then just press the Power button, while still holding the two other keys.On new Chromebooks, though, we’ll be talking about that. Look in your Owner’s Manual or search up how to enable developer switch on an older Chromebook. On older Chromebooks, there’s usually a switch to enable Developer Mode. download Crouton (you have to do this after you get into Developer Mode.).To install Ubuntu Linux on your Chromebook, you have to do the following: If you choose to install Unity on your Chromebook (the OS, not Unity 3D) well you’re in the right place We will use Crouton for this method. You know, Chrome OS is a great, simple, and fast Operating System, but sometimes it might get a little bit boring, without the ability to install cool programs in your computer. In Developer Mode, you have the ability to customize your Chromebook, such as installing another Operating System.

The first thing you need to do is to get your Chromebook into developer mode.

Install crouton chromebook