The Ubuntu 5.04 LiveCD is great, but it has one fatal flaw: the screensaver prompts for a password. Luckily, using the magic of Unix TTYs, you can get around this.
- Press Ctrl+Alt+F1 to switch to tty1.
- Run "sudo -s" to switch to root, the superuser. Unlike normal sudo commands, you do not have to enter a password for this.
- Change the password for the default user "ubuntu" by running "passwd ubuntu." Enter a new password.
- Press Ctrl+Alt+F7 to switch back to tty7, where the X server (read: all graphical applications) is running. Enter the new password into the screensaver's lock dialog.
- Continue using your computer.