Comment 45 for bug 657736

Not sure if any of you are still trying to find a fix for this bug, but I found one method of resolving this bug fairly easily. I used the boot argument that Marius Kruger posted (nomodeset,) to boot Ubuntu in safe video mode, then I accessed the Additional Drivers feature, and used that to install the latest official nVidia drivers. After I did this Ubuntu booted up normally without any issues. Good luck!