Comment 7 for bug 466745

I went into /etc/grub.d and did a sudo chmod -x 30_os-prober, and then of course sudo update-grub. The result is that on the grub menu, where it previously said Windows XP Pro at the bottom, it now says Ubuntu at the bottom without specifying a build. If I choose that bottom option, I get the same error that Windows XP Pro was giving:

unknown command 'drivemap'