If you used a boot option to run the live cd you will need to use that option to boot the final installation. Which option did you use (eg acpi=off,nomodeset etc)?
WHen the grub menu shows and the system you want to boot is highlighted (Ubuntu) press the "e" key. On the next screen navigate to the end of the line which ends with "quiet splash" and, using the backspace key, delete those words, then type in the boot option you used earlier (acpi=off or whatever) then press ctrl+X to boot.
It may be that that boot option will not be required if graphics drivers are installed (via System > Admin > Additional Drivers).
If that is not the case, the boot option can be made permanent using the guide below. Scroll down the page for that.
http://ubuntuforums.org/showthread.php?t=1613132
Bookmarks