Installing Minecraft on a Chromebook is simple. Get Crouton, install Saucy and XFCE then get stuck. Why stuck?
You need to change the permissions of the Minecraft.jar to be an executable.
On many versions of Ubuntu, it is a simple matter of right clicking and checking the “make executable” check box. Using the standard Thunar XFCE file manager, that isn’t an option.
You have a couple of choices here. Installing a new file manager is a possibility, but if you are running XFCE or other light version of Linux, maybe you simply don’t want to do that.This is a great chance to use the terminal to do what you want. The command needed is “sudo chmod +x”.
As you can see from the screenshot, I am using XFCE on a Chromebook, so my directory line is a little different.