Comment 9 for bug 466745

Carlos,

Your problem seems much worse than what we were talking about. We just saw an extra option at the bottom of a list of options in the grub menu that gave the drivemap error. The top option was to get into the most recent version of Ubuntu and worked fine.

I never followed up on this problem because I just set the grub menu to not show up anymore since the choice had already been made with the Windows boot menu. Later, I stopped using Windows and just did a clean install from disk.

I think you should present your problem as a new question or bug because it's not the same problem that was being discussed here.