How do I Fix Grub Error 15 on New Dual Boot Install

Question

I just installed 12.04 to Dual Boot (separate partitions) with an existing Win 7.
Upon reboot after install things freeze after Grub 1.5 with a Grub Error 15 message.

Is there any easy way to fix this? (I am posting this from my second computer)

UPDATE: I managed to boot into both 12.04 and Win7 using BIOS:

Selected the disk with the Win7 'C' Partition: resulted in the same error message
Rebooted, tried the disk with the Ubuntu Partitions:
*Grub Menu loaded:
Managed to boot 12.04, rebooted, used BIOS again:
Managed to boot Win 7

So, I have access to my computer again (thru BIOS), but this has been a pretty crappy install experience.

Garth

I used the the Final release 12.04 Ubuntu install disk, reformatted all Linux partitions, and expected a simple clean install. 
Other than specifying the Ubuntu Partitions, I did a basic install of 12.04. 
No way I did do anything to get this crap error failure!
I have no idea why my install resulted in a Grub-15 error.

Jorge Castro · Answer

OP posted:

I burned a RescuTux  Disk and used it to recover grub2 (simplest and easiest way for me. 
  http://www.supergrubdisk.org/category/download/rescatuxdownloads/

ashutosh · Answer

Grub error 15 list that "file not found", because of the wrong table of partitions. You can reconfigure your partitions by editing menu.lst file found in

/boot/grub/menu.lst

For that, you can use live cd to open up terminal and type:

sudo fdisk -l | grep -i linux

This will list out the linux partitions and check the entry if the linux root device and swap device entry are correct. You can use disk monitor to view that in fancy mannar. If they are on the way, then you just have to reboot the system. check more out here if you have problems.

How do I Fix Grub Error 15 on New Dual Boot Install

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