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Old 12-27-2013, 10:57 AM   #1
monis
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Question error on restart of computer (Unknown File system ; grub rescue)


Hey Hi
I have dual boot system having windows 8 with Ubuntu 12.10, I was partitioning my disk size in windows 8 after that I restart my laptop facing
error :unknown file system
grub rescue>
I followed steps :

1. ls (which showed all the partitions)
(hd0)(hd0,msdos7)(hd0,msdos6)(hd0,msdos5)(hd0,msdos4)(hd0,msdos2)(hd0,msdos1)

2.set (showed current pointing location)
prefix = (hd0,msdos5)/boot/grub
prefix=(hd0)/grub
root=hd0
grub>rescue

3. I remember Ubuntu was either in msdos6 or msdos4, I tried
set root=hd0,msdos6
set prefix=(hd0,msdos6)/boot/grub
insmod normal
ERROR:UNKNOWN FILE SYSTEM

4. I changed to set prefix=(hd0,msdos6)/grub
but faced same error

5. Then I tried for all, getting same error--> Unknown File system

please help how I can set the path, I have important data in my drives.

Looking forward for your help
 
Old 12-27-2013, 12:37 PM   #2
fuorviato
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Can you show you partition table please? (as root)
Quote:
fdisk -l
 
Old 12-27-2013, 12:57 PM   #3
monis
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I am a new user, can you tell how to check
Thanks
 
Old 12-27-2013, 01:36 PM   #4
fuorviato
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As you can see, I gave you the command to issue.

1) become root :
Quote:
sudo su
--> enter password

2) issue the command
Quote:
fdisk -l > 'partition table'
3) Paste here the content of the file 'partition table'

Do some googling on fdisk command. It's handy for displaying info about your partition.
When you do, you'll understand why we need the "-l" parameter.

Last edited by fuorviato; 12-27-2013 at 01:39 PM.
 
Old 12-27-2013, 01:58 PM   #5
monis
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Hey
I tried all the commands only ls,set is working for other commands sudo nd others getting same message "unknown command".
I have also googled in various fourms but not got any satisfactory result.
Only ls, set is working.
 
Old 12-27-2013, 02:39 PM   #6
fuorviato
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OK, so issue
Quote:
su
and then type in the administrator password, then go on with the rest.
 
Old 12-27-2013, 04:01 PM   #7
yancek
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If you are at a grub prompt, the fdisk command won't work as that is not one of the Grub commands. Use the medium (CD/DVD/Flash) you used to install Ubuntu or any Linux Live CD. Boot it, and run the command. What does ' I was partitioning my disk mean'? Did you delete/resize a partition or what?
 
Old 12-28-2013, 02:41 AM   #8
monis
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thanks for the help
 
  


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