I was installing Ubuntu 10.04 on my Google Laptop tonight. I wanted to test out the wireless access first before I went ahead with the installation, so I run it as a live cd first. The broadcom card inside didn’t have a open source driver, but there was a properietry driver available, so I went ahead with it. It wanted a restart, which is silly when running as a live cd. So I did the next best thing, logged out of the current user session!
On the login screen however, I wasn’t sure what the username and password were. Well, clearly, the username was ubuntu but the password? A user named johl in a ubuntu forums thread provided the answer: it is simply blank! Try it, enter ubuntu as the username and nothing as the password while running as a live cd and you’ll get right in!