"Grub loading ...Error 18" - HD's not accessible any more. (Kubuntu Karmic/ WinXP)

[Tom H]

>> "GRUB Loading stage 1.5"
>> you must have grub1 as your boot loader. To re-install grub1, ....

> Now, I remember that there was an upgrade to Grub2 along the recent
> updates, probably already a few months ago. So, I think reinstalling
> Grub1 is not a wise option.

My point was that you are booting with grub1 because grub2 does not
have a "stage 1.5".