Show chroot install options:
sh ~/Downloads/crouton -t help
Install Ubuntu 14 (Trusty) Gnome Desktop Environment chroot:
sudo sh ~/Downloads/crouton -n trusty-gnome -r trusty -t audio,cli-extra,keyboard,gnome,xiwi
Install minimal Ubuntu 14 (Trusty) CLI chroot:
sudo sh ~/Downloads/crouton -n trusty-cli -r trusty -t cli-extra