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When I try to boot I get this message:

error: unknown filesystem. grub rescue> _

results of:

grub rescue> ls

are as follows:

(hd0) (hd0,msdos5) (hd0,msdos1) (hd1) (fd0)

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1 Answer

If you don't know your Ubuntu boot partition, check them one by one:

ls (hd0,msdos5)/

ls (hd0,msdos1)/

When you hit the right one, you'll get a line mentioning "lost+found" an so on.

Assuming (hd0,msdos5) is the right partition:

set prefix=(hd0,5)/boot/grub

set root=(hd0,5)

insmod normal


Now you'll be able to boot into Ubuntu. Once you do, reinstall GRUB:

sudo update-grub

sudo grub-install /dev/sda

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I ran the first two commands with (hd0,1) in place of (hd0,5) as (hd0,msdos1) was the correct partition... they produced no message so I assumed they worked, but when I ran insmod normal... it gave me this message: error: file not found. Then I ran the normal command and it rebooted to the same problem (unknown filesystem) I am running 12.04 LTS Server Version if that changes anything. Thanks again! –  Chandler R. Nov 12 '13 at 16:18
Nevermind that. I got it fixed! Thank you so much! –  Chandler R. Nov 12 '13 at 16:45
Ur wlcm. Plz mark as answered. –  Pavel Nov 12 '13 at 18:07
thank you very much.. life saver! –  Sumoanand Jan 27 at 8:31
Hi Chadler..i am getting file not found error when i type insmod normal. please help me –  Ekaveera Apr 4 at 6:22
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