With using Crouton (chroot), Gallium (dual boot), Virtual Terminal, and other solutions.
See official Google site that is all about ChromeBooks
The Saint Louis MO, STL Linux Users Group meets monthly to talk about Linux. This GNU/Linux Users Group usually holds its meetings on the third Thursday of every month. Meetings are free and open to everyone.
Basics: The regular ITE meeting room is open and available from 6:30 PM to 9:00 PM. At 6:45 PM we start with introductions, announcements, current events of interest, and a general CALL FOR HELP segment. Then we will go into the presentation of our main topic sometime around or after 7:00 PM.