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[sadfub <sadfub@xxxxxx>]

I confirm this bug on a Eee PC 900A with Ubuntu Eee 8.04.1 and I fixed
this like ewolff but a little different. The source of this error is
that when you install from USB stick the USB stick is /dev/sda (and
hence hd0 for grub) the internal SSD instead is then /dev/sdb and for
Grub hd1. Hence it writes to boot from hd1,0 in /boot/grub/menu.lst
instead of hd0,0. workaround:

when you come to the error, get access to the grub shell (I think hitting enter and the 'e' for edit the first line) then adjust the line to your hdX needs and press 'b' for booting... now you only have to change the /boot/grub/menu.lst like ewolff said...
alternativley you could boot also with plugged in USB stick... to boot for the first time. After all you don't have to reinstall grub since grub reads the menu.lst before booting. hence `sudo grub-install ...........` is NOT necessary!

** Changed in: ubuntu-eee
       Status: New => Confirmed

-- 
Installation of GRUB wrong
https://bugs.launchpad.net/bugs/238780
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Status in Ubuntu Eee: Confirmed

Bug description:
After installation all I get is:

GRUB Loading stage1.5


GRUB loading. please wait
Error 21

This is an install to a SD card so I assume the filesystem mapping is incorrect.