Comment 25 for bug 32357

I have a mixed SATA / ATA system and same thing happens.

During the installation, it seems that the ATA drive was detected as hd0 and grub installed itself there. SATA were hd1, hd2.

During the boot, grub detects SATA discs as hd0 and hd1, while ATA is hd2.

I fixed it by re-doing the grub-install from the rescue console and editing /boot/grub/menu.lst to change every occurence of hd1 with hd0.

Happened to me before, on Ubuntu 7.04. I'm really amazed it didn't get acknowledged/fixed so far.

@ Simon Law:
The problem is different detection of drives during the installation and after, ie. during the boot of the installed system. It has nothing to do with the hardware itself, rather than with (wild guessing) different kernel, different module loading/order and such from the installation disc compared to installed system.