Comment 33 for bug 641259

@Mark, I posted my comment as a suggestion to improve the release notes so as people with affected computers can downgrade grub-pc to grub *before* updating to maverick, so that they are not affected by the bug.

In any case, you can fix your installation using the lucid alternate image, select recover system and run a shell in the maverick installation. From that shell you can replace grub-pc with grub. Then you exit the shell and select "install boot manager" (or something like that) in the menu. Not simple for the average user, but it is faster than installing lucid in the disk again.

HTH.