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I know it's stupid now, after I checked the internet, but I just formatted a partition that I had installed GRUB to.

Now, whenever I boot, I end up with ERROR 15 (which means "FILE NOT FOUND").

So, I got my Ubuntu 11.04 live disk out and installed it on top of the formatted partitition, and now at least I can boot - but I want to get rid of the duplicate Ubuntu now.

I think what I need to do is make GRUB look back on my first partition - which I have established to be /dev/sda1, or (hd0,0) in GRUB-talk. But, when trying

grub> root (hd0,0)
grub> setup (hd0)

or trying:

grub> root (hd0,0)
grub> setup (hd0,0)

I end up with:

Checking if "/boot/grub/stage1" exists... no
Checking if "/grub/stage1" exists... no

Error 15: File not found

Which is NOT good!

My sudo fdisk -l looks like this (run from the live installation):

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ce6db

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       28210   226594816   83  Linux
/dev/sda2           29255       30402     9212929    5  Extended
/dev/sda3           28210       29255     8388608   83  Linux
/dev/sda5           29255       30402     9212928   82  Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 7948 MB, 7948206080 bytes
245 heads, 62 sectors/track, 1021 cylinders
Units = cylinders of 15190 * 512 = 7777280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00077236

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1        1021     7754464    b  W95 FAT32

(Note: sdb1 is my livedisk, an 8GB SD Card)

PS: The reason I'm going through all this is because I want to install Android-x86, but the GRUB it comes with wont recognize Ubuntu, so it's not much of a dual-boot.

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Dif you formatted the partition where there were only grub or the whole Ubuntu? – Matteo Pagliazzi Jul 27 '11 at 21:05
The partition I formatted had GRUB installed, and it was Android-x86. I think my GRUB is installed to the MBR, because as mentioned there doesn't seem to be a /boot/grub/stage1 inside my main Ubuntu partition. So, effectively, there was only GRUB on that partition. My Ubuntu is, thankfully safe. – drnessie Jul 27 '11 at 21:13
I should probably mention that I can boot into my main Ubuntu - though only through the Ubuntu I installed from my livedisk 30 mins ago. That's not what I want, as it takes up disk space, and time when booting up (it means I have to watch the screen util GRUB is up then use the arrow keys to select the main Ubuntu). – drnessie Jul 27 '11 at 21:15
up vote 0 down vote accepted

You say you can boot into your old Ubuntu. If that is the case, it should be fairly easy to fix this. Open a handy terminal and try this on the main Ubuntu:

sudo update-grub
sudo grub-install /dev/sda
sudo grub-install /dev/sda --recheck

As for getting Android to work, you might be able to install it without a bootloader. Then boot into the main Ubuntu and run

sudo update-grub

and see if that finds it.

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