On Fri, Dec 19, 2008 at 5:21 AM, xcut <christian.nentw...@gmail.com>
wrote:

> I encountered the same problem (grub error 2) after installing, and this
> cost me many hours. I considered recommending Ubuntu for some non-
> technical friends, but it seems that this still won't be an option.
>
> Anyway, here is a complete summary:
>
> - I have an internal NVIDIA mirror RAID with Windows on it. Touching that
> RAID or writing anything on it was not an option
> - Decided to install Ubuntu to external USB disk
> - Installed Ubuntu 8.10 using the alternate installer
> - Created 100mb boot partition (sdc1), 100 gig root (sdc5) and 5 gig swap
> (sdc6)
> - Selected "do not install GRUB to default location" and forced install to
> /dev/sdc (the MBR of the external drive)
>
> Then rebooted, and put the external drive before the internal in the
> boot order.
>

By changing the drive order you made the drive stop being /dev/sdc (hd2,0)
and it became  /dev/sda (hd0,0)

What you want to do is specify the boot drive usually with a F12 menu in the
bios.  Not change drive order which is what causes grub to fail.

-- 
Grub installs to wrong drive's MBR in default install. No way to change in 
standard installer.
https://bugs.launchpad.net/bugs/46520
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