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testdisk put my partition table into sector order. Next I ran update-grub to rewrite the bootloader. Now every boot lands me at

error: no such partition. 
grub rescue>

The only thing that gets me booting is the solution

using (hd0,msdos3)

When I run set in the grub rescue mode above, I see it persists with the former (hd0,msdos4)

What should I do to fix this? It's Ubuntu 11.10

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Eventually found it myself.

The command that got it booting properly again was

grub-install /dev/sda3

Since that was the partition marked active. Also it seems that in grub-speak, (hd0,3) and (hd0,msdos3) are interchangeable.

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