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Old 01-09-2010, 05:16 PM   #1
magnecticfield
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Registered: Oct 2009
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GRUB error: unknown filesystem, grub rescue


Hi, I have dual boot with Ubuntu 9.10 and Windows 7. Today, after using Partition Wizard on Windows to resize its partition, I got the following message when reboot:

Code:
error: unknown filesystem
grub rescue >
I dont actually know what to do, I've been reading some threads on the internet but nothing equal to my case, only people who installed Windows after Linux and lost GRUB. Do I just need a live CD to reinstall GRUB? Can somebody tell what to do? Thanks.
 
Old 01-09-2010, 07:17 PM   #2
syg00
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Have a read of this
 
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Old 01-09-2010, 07:33 PM   #3
anj
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I have an idea to fix this!
You need to boot from ubuntu , you need to edit boot load ( grub ), computer is booting to grub edit it ! or create a new command line !
This is a template !
root (hd0,0)
kernel /vmlinux-version(you can table it ) ro root = /dev/hdaN
initrd /initrd-version
Now press ctrl+x to boot it .
sorry , my english is bad , so , I don't know do you know what I mean !
dit it work ?
in system you just to perfom a command : upgrade-grub(after I forget , you can table)
 
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Old 01-09-2010, 10:11 PM   #4
magnecticfield
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Well, thanks syg00, I reed it and found a a solution in the part about the rescue mode, had to manually boot to Linux and after it I re-installed grub.
 
Old 01-31-2010, 02:28 AM   #5
NiceIce
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I had the same error

Heyy,, I'm new to Linux Community !!
Please, can u tell me in details(steps) how I can fix it ?

thanks in advance
 
Old 01-31-2010, 02:33 AM   #6
EricTRA
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Hello NiceIce and Welcome to LinuxQuestions,

Instead of hijacking other threads, although related, you should start your own thread. That way it'll get the attention it deserves.

In regards to your problem, have a look at this tutorial at chapter 8, it states how to repair GRUB2 and in Chapter 5 there's also a description of dual booting Win7 and Ubuntu.

Kind regards,

Eric
 
Old 01-31-2010, 03:36 AM   #7
NiceIce
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Ok,, thaanks very much EricTRA for ur welcoming and answer
 
Old 01-31-2010, 03:40 AM   #8
EricTRA
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Hi,

You're welcome, I hope you get it solved using that tutorial. If not, then post where you get stuck and you'll be helped real soon.

Kind regards,

Eric
 
Old 01-31-2010, 03:46 AM   #9
miros84
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Quote:
Originally Posted by magnecticfield View Post
Hi, I have dual boot with Ubuntu 9.10 and Windows 7. Today, after using Partition Wizard on Windows to resize its partition, I got the following message when reboot:

Code:
error: unknown filesystem
grub rescue >
I dont actually know what to do, I've been reading some threads on the internet but nothing equal to my case, only people who installed Windows after Linux and lost GRUB. Do I just need a live CD to reinstall GRUB? Can somebody tell what to do? Thanks.

Hello
When you have made some new partition or just move partition, you will changed the orden of your partition. That's why you get this error.

The easiest way to fix that is with SGD. This is a disk that will automaticly will fix grub for you. You can download it here:
http://www.supergrubdisk.org/

And second way.
You have to boot live cd Ubuntu.
With
Code:
sudo fdisk -l
you have to look where Ubuntu is installed.
Then you have to mount it:
Code:
sudo mount -t ext3 /dev/sda2 /mnt
you have to change
Code:
/dev/sda2
depend of your case
and then install grub again.
Code:
sudo grub-install --root-directory=/mnt/ /dev/sda
 
Old 08-03-2010, 11:46 AM   #10
everspawn
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upgrade-grub function

Quote:
Originally Posted by anj View Post
in system you just to perfom a command : upgrade-grub(after I forget , you can table)
Does this detect existing OS's & write them into the grub file for you or what does it do?
 
Old 10-10-2010, 07:35 AM   #11
JesseTaiwan
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Smile

Thank you so much! This worked so easily. The first time it happened I reinstalled my whole system!
 
Old 10-11-2010, 12:58 AM   #12
gard
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I dont know if my post is here in the right place or not . ?


I wish to change the grub order of differents OS in an UBUNTU 10.04.
This ordre is in /boot//grub/grub.cfg and this file can't be modified.

How can i put there the Linux entry in the second place. ?

The Ubuntu Documentation is well rich but i can't find this answer.



Thanks
 
Old 11-14-2010, 09:55 PM   #13
d4m13n
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Hello gard,

first you need to go to the terminal and type
Code:
sudo gedit /boot/grub/grub.cfg
now you have write access to the grub config file.

Alternatively, you can do this instead of opening gedit
Code:
sudo nano /boot/grub/grub.cfg
nano is the built in text editor for terminal.

I hope this helps,

d4m13n.

PS. this is my first post so tell me how i did
 
Old 03-18-2011, 11:48 PM   #14
Chris C
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Need help with Ubuntu GRUB error

Hello Ubuntu experts:

I'm very new to this forum and I'm a beginner at using Ubuntu. I am using my wife's computer with a Windows operating system in order to seek help on how to fix my computer that has I think the latest version (Version 10.0 or something close to that) of Ubuntu downloaded on it.

I tried booting up my system the other night and upon booting up I received the following error:

GRUB error: unknown filesystem.
grub rescue>

Can someone help me walk through the steps to fix this error so that I can use my computer again? Being that I so new to using Ubuntu I would greatly appreciate step by step (detailed) instructions.

Thank you so much in advance.

-Chris C
 
Old 03-18-2011, 11:58 PM   #15
EDDY1
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rescue from cd is almost at the end of tutorial
https://help.ubuntu.com/community/Grub2
 
  


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