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I have got a machine with dual-boot Windows 7 and Ubuntu 11.10, and I wanted to add another OS to that (Jolicloud), so I started the partition manager in Windows and shrunk the Windows partition by about 10 GB (so now I have:Windows;currently empty 10GB;Ubuntu). I shutted down the computer because I was finished. Now when I started my machine again it says

error:no such partition.
grub rescue>

and I can type commands. ls gives

 (hd0) (hd0,msdos5) (hd0,msdos4) (hd0,msdos2) (hd0,msdos1) (fd0)

if that helps

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For future reference, shrinking an in-use windows partition rarely goes well. – David Nov 29 '12 at 16:43
up vote 0 down vote accepted

I have found the solution. I used the boot-repair from via a live CD of Ubuntu 10.04 (i bet this also works via a live USB). I checked "reinstall GRUB" and "purge GRUB before reinstalling it" in the advanced options, and now it works. :)

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