Crouton with more than one OS

ChromeOS

http://ift.tt/X9lnNC

Using sudo sh ~/Downloads/crouton -t xfce -r utopic I can install ubuntu 14.10 with the xfce interface, it says I can load it up on chromeos by running sudo startxfce4 . But if I want to install another version, sudo sh ~/Downloads/crouton -t xfce -r kali , it gives me the same exact command to run that. I can install as many OS's as I want, but how do you run the others if you install 2 OS's with xfce for example? Since I installed utopic first, that's the only one that opens.