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Thread: grub error: "unknown filesystem" after deleted partition

  1. #1
    Join Date
    Aug 2011
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    Question grub error: "unknown filesystem" after deleted partition

    Hey all,

    Recently dual booted windows xp sp3 with ubuntu 10.10. I later, realizing i was running out of hard drive space, I deleted the partition which had ubuntu on it while running windows. Later windows auto rebooted my computer (AAAHHHH.) and, where grub usually popped up, it said:

    error: unknown filesystem.
    grub rescue>

    I checked on another thread but it was a different scenario, they hadn't deleted the ubuntu partition.

    Anyway can I delete grub to boot windows through a live cd? or is there something in grub rescue I can do to fix? I have command line experience (though not in grub).

    Thanks everyone.

  2. #2
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    Dec 2008
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    Ubuntu 12.04 Precise Pangolin

    Re: grub error: "unknown filesystem" after deleted partition

    You have no Grub files to boot as you deleted them when you deleted the Ubuntu partition. You will need to repair your Windows MBR using a Windows install disk or the XP recovery console if you have it installed.
    EasyBCD.
    PrintersDatabase
    Boot Info Script: How to
    The post above and the post below suffer from the Rashomon effect!

  3. #3
    Join Date
    Jun 2007
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    China
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    Ubuntu 12.04 Precise Pangolin

    Re: grub error: "unknown filesystem" after deleted partition

    Here's a link on how to do it:

    http://helpdeskgeek.com/how-to/fix-mbr-xp-vista/

    However, I think you made a mistake surely you should have deleted the Windows partition?

  4. #4
    Join Date
    Aug 2011
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    Re: grub error: "unknown filesystem" after deleted partition

    Its a family computer so no general happiness on deleting windows

    thanks for the help! I ended up misplacing the windows disk so i found someone who posted a thread on how to fix the mbr in an ubuntu live cd. Thanks for leading me in the right direction.

  5. #5
    Join Date
    Dec 2010
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    Re: grub error: "unknown filesystem" after deleted partition

    My issue must be in some related to the OP, so I reckon I should seek help here instead of opening a whole new thread.

    When I boot my laptop(dell inspiron from 2006, ubuntu 10.04) it goes directly to

    error: unknown filesystem
    grub rescue>
    I tried
    grub rescue> set prefix=(hd0,5)boot/grub
    grub rescue> set root=(hd0,5)
    grub rescue> insmod normal
    but its reply to that..
    error: unknown filesystem
    There was another solution I saw elsewhere that involved something along the lines of "~sudo mount ...." , but my grub rescue keyboard layout does not have the "~" symbol.

    Any assistance would be greatly appreciated.

  6. #6
    Join Date
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    Ubuntu 14.04 Trusty Tahr

    Re: grub error: "unknown filesystem" after deleted partition

    @RDLP715
    Even though it is the same error, boot issues often are unique as everyone's system is different. Start a new thread and post this from a liveCD.

    Boot Info Script courtesy of forum members meierfra & Gert Hulselmans
    Page with instructions and download:
    http://bootinfoscript.sourceforge.net/
    Paste contents of results.txt in a New Reply, then highlight entire file and click on # in edit panel(code tags) to make it easier to read.
    Or You can generate the tags first by pressing the # icon in the New Reply Edit toolbar and then paste the contents between the generated [ code] paste here [ /code] tags.
    V60 has improved formating and requires code tags to make it legible. New Version is a zip file that you have to extract to get .sh to run.

    You can also do it from this and it may make the repairs for you.
    Yanni has created a easy way to download boot repair & run script Maverick:
    HOWTO : easily create a Boot-Info summary
    http://ubuntuforums.org/showthread.php?p=11164270
    Last edited by oldfred; August 19th, 2011 at 11:49 PM.
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  7. #7
    Join Date
    Oct 2011
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    6

    Re: grub error: "unknown filesystem" after deleted partition

    I had the same problem of filesystem error
    and i tried reloading the ubuntu within windows and guess wat my problem is solved...

  8. #8
    Join Date
    Sep 2009
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    11

    Re: grub error: "unknown filesystem" after deleted partition

    @mrbiscuits: How do you fix MBR using ubuntu live CD. I am in the same situation. Please guide me. I just want my windows 7 back. I deleted linux partition from windows. Thanks in advance

  9. #9
    Join Date
    Jan 2013
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    1

    Re: grub error: "unknown filesystem" after deleted partition

    Use Super Grub Disk . Its Better Option Solve This Kind Of grub Problem http://www.supergrubdisk.org/super-grub-disk/

  10. #10
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    Xubuntu Development Release

    Re: grub error: "unknown filesystem" after deleted partition

    Old thread closed.

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