Serious GRUB booting problem after install Ubuntu 9.10beta for testing it.

[Luis Maceira]

I installed 9.10beta for testing it on an external USB HDD partition (/dev/sdb7),and I have 9.04 on /dev/sdb5(where the default GRUB stage2 is),I also have 9.04 on the internal SSD drive ( partition /dev/sda3 ).Now I am not able to boot Ubuntu 9.04 on my internal SSD drive.When I disconnect my external USB HDD the booting process gives me:
GRUB loading...error: no such diskgrub rescue>_
When the external USB HDD is connected and I call the GRUB menu and it appears,the system(9.04) on the internal SSD appears normally on the GRUB menu (I think everything is OK) choose booting the SSD but then the warning:
Error 17 : cannot mount selected partitionPress any key to continue...    (and return back to GRUB menu)
>From my working
 systems 9.04 and 9.10 on the USB HDD I mount the filesystem on the internal SSD and everything appears OK even the /boot/grub directory,so in my opinion the installer of Ubuntu 9.10beta messed up with GRUB stage 1 on the MBR of the internal SSD and the way to the right partition /dev/sda3 is lost.
Any way to revert this ? without installing Ubuntu from scratch on the internal SSD.


                                                  Thanks.




      
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