Download crouton from GitHub link (google it)
Install the crouton extension from chrome webstore
Invoke developer mode (Ctrl d will.bypass the oss verification screen)
Open chrome and press Ctrl + alt +t to open up terminal
Type shell
Run command
sudo sh ~/Downloads/couton -t xfce-desktop,keyboard,xiwi
After install
Run command
sudo startxfce4
(I used the xfce-desktop command because it comes with alot more preinstalled apps,.like Mozilla for one, you need to have the chrome browser crouton extension installed and MUST use xiwi in the command or it will not work on the Samsung Chromebook plus)
***The other above will.work on majority of Chromebook with Intel, ours is arm based and xenial is the only one I have been able to get to work good. I am looking into mint but it doesn't look to support arm yet. I personally chose arm over Intel for it runs google play apps better and more of them over Intel based processers, and google is to laid back to force devs to support Intel any time soon. If you specifically want Linux then go buy one with a intel processor, and wait till the apps are updated for it, IMO I'll be due for a new upgrade by the time that happens, for now I'll just dual boot my windows laptop for a better Linux distro :)