Everybody will understand this problem I think, but somebody will have the solution (I can't find it on here even after searching). It's a straightforward (!) boot up issue (I wish!!!!).
I have a laptop with several partitions. One of them is Ubuntu 12.04.1, another is Oracle VM, another is Windows XP etc. I made an adjustment via a partition manager within XP and upon the re-boot I've got the dreaded "grub rescue>" prompt.... I cannot boot from CD or USB versions of any of these; Windows XP, Ubuntu 12.04.1 Live, Rescatux, Super Grub2 Disk, or even Boot Disk, which means I'm very unsure of how to repair / re-config the grub record or even fix the Windows MBR and then sort out things from there.
Thanks to other posts, I can find the folder with several dozen *.mod files. So I'm pretty sure I'm in the right partition now (even if it's slightly corrupt or now in the wrong order etc). From "grub rescue>" I typed "ls (hd0,msdos5)/boot/grub" to find this area and this is after the "error: unknown filesystem" response to the other options (Hd0) (hd0,msdos6) etc.
I have to other MAC OSX machines which I normally use, but I can't think how to solve this at all (very limited knowledge of Ubuntu to date). If anybody sees this and thinks they have a possible solution, I'd be really appreciative of the commands or procedure to recover. I need the data on the disk but I am happy to re-install operating systems if needed.
I'm very sure that this is simply down to the partition mod unfortunately but I'm sure somebody will know how to recover this (fingers crossed!)