I just figured this out and wanted to share.
When I would boot from the Live Cd, even with nomodeset and acpi=off, I would only get to the command line. No GUI.
If you are having this problem and you have the radeon card you can do the following...
reboot your computer from the cd rom drive
hold the SHIFT key while booting so you can get to the selection screen. Choose your language, cursor over Try Ubuntu without Installing
Press F6, choose nomodeset
it ESC and then ENTER to boot.
Once you are at the text login
Code:
apt-get remove xserver-xorg-video-radeon
Press CTRL + ALT + F1
Code:
service lightdm start
Voila, you are now at the 11.10 unity live mode.