This question already has an answer here:
Alright so I installed the crouton Ubuntu thing on my Chromebook while following this tutorial. After getting it installed it would not let me set a password and now I can't update the system so I'm wondering how to fix it. I'm kind of noobish at this.
This is what is displayed-
(precise)redeyeschivo@localhost-$ sudo password set [sudo] password for redeyeschivo: