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Thread: Grub error

  1. #1
    Join Date
    Nov 2006
    Location
    Gurgaon, India
    Beans
    200
    Distro
    Ubuntu Studio 13.04 Raring Ringtail

    Grub error

    In windows 7 i was resizing my partitions, by mistake i have deleted my root partition of my ubuntu 11.04 setup. Now when i restarted my laptop it gives the following error

    error: no such partition.
    grub rescue>
    I understood that my MBR is corrupt. How do i repair my MBR without installing ubuntu all over again.

    Please note:
    i have found solutions which say insert windows 7 cd (example is given below ). The trouble is i dont have a windows 7 cd. How do i do it using my ubuntu 11.04 setup cd. If you recommend another software please indicate where i can download it from.

    HTML Code:
    http://www.ehow.com/how_4836283_repair-mbr-windows.html

  2. #2
    Join Date
    Apr 2008
    Location
    Australian in Germany
    Beans
    4,010
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Grub error

    I daresay your MBR is not corrupted so much as looking for a partition that is not there anymore.

    You say you have deleted your ubuntu partition. The only solution to that is probably to re-install. If you are really lucky, you may be able to re-construct what you deleted using data rescue tools if you haven't been using the drive since. The data is still there, as far as I know, until you save something over it. This is unfortunatly beyound my skills.

    If there are no files on the Ubuntu install that you desperately absolutely have to recover, then I would suggest re-installing. I take it the Windows install still works? Doing a re-install should sort out your grub too.

    If you haven't already, you might consider making a seperate partition for your /home. That would allow you to just re-install the Ubuntu OS and re-use the existing /home, which is where all your files and config files is.
    Michael

  3. #3
    Join Date
    Jun 2009
    Location
    SW Forida
    Beans
    Hidden!
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Grub error

    The Windows boot loader in the MBR is actually pretty simple. All it does is look for a active partition (boot flag) and jump to the partition boot sector to continue booting. Many other boot loaders use similar booting methods and will work to boot Windows.

    The newest versions of Ubuntu may not have synaptic installed and I do not know how to turn on the universe repository from command line.

    If issues install synaptic and then enable universe as a source.
    sudo apt-get install synaptic

    Restore basic windows boot loader - universe enabled
    Simply open Synaptic and Settings > Repositories and tick the box against the Universe repo in the Ubuntu Software tab. Close that window and click on reload before installing lilo with Synaptic or command line.
    sudo apt-get install lilo
    sudo lilo -M /dev/sda mbr
    May show error messages about the rest of lilo missing, ignore, we just want MBR with bootloader.

    Another way that installs the syslinux boot loader:

    Boot Repair:
    https://help.ubuntu.com/community/Boot-Repair
    You can repair many boot issues with this or post the link to a run of boot info script so we can see your exact configuration.

    Once you get Windows booting:
    Make your own Windows repairCD (not vendor recovery):
    http://windows.microsoft.com/en-GB/w...em-repair-disc
    http://forums.techarena.in/guides-tutorials/1114725.htm

    Windows 7 repair USB, Also Vista if service pack installed
    http://www.intowindows.com/how-to-re...tion-dvd-disc/
    http://www.webupd8.org/2010/10/creat...usb-drive.html
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  4. #4
    Join Date
    Apr 2010
    Location
    PNW on E-side Cascades
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    363
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Grub error

    OP said, ". . . by mistake i have deleted my root partition . . ."

    Only option is reinstall, this time doing as audiomick says and create a /home partition.

    We all make mistakes, then we have to fix them -- Welcome to Linux, which assumes you know exactly what you are doing (as a Mod's signature states)!
    Nonsense is an assertion of man's spiritual freedom in spite of all the oppressions of circumstance-- Aldous Huxley
    The real power of Linux lies in the command line

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