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Thread: I need to reinstall Grub 2, but how?

  1. #1
    Join Date
    Dec 2009
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    17
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Question I need to reinstall Grub 2, but how?

    Today I reinstalled my Windows partition of my PC. If you need to know, my config is like this
    -Windows (formally XP MCE, now Vista Ultimate) on Partition 1
    -Windows Recovery on Partition 2
    Logical Partition
    -Ubuntu 10.04 Lucid on Partition 3
    -Ubuntu Swap

    I have to reinstall GRUB because Windows wrote over the MBR.

    I have a 10.04 install disc, but I do not know how to reinstall Grub2

    how do I reinstall Grub2?

  2. #2
    Join Date
    Jan 2007
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    Hidden!
    Distro
    Ubuntu Development Release

    Re: I need to reinstall Grub 2, but how?

    This post should help you restore your Grub installation:
    How to restore the Ubuntu/XP/Vista/7 bootloader (Updated for Ubuntu 9.10)

    Should work for Lucid as well for those reading this with a 10.04 install.
    Last edited by drs305; May 17th, 2010 at 02:26 AM.
    Back to Xorg...

    Retired.

  3. #3
    Join Date
    Dec 2009
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    17
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Question Re: I need to reinstall Grub 2, but how?

    Where exactly does it say anything about GRUB2 in there

  4. #4
    Join Date
    Jan 2007
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    Hidden!
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    Ubuntu Development Release

    Re: I need to reinstall Grub 2, but how?

    D'oh, sorry. Right title but apparently the answer to another post was still in memory. I've corrected the original.
    Back to Xorg...

    Retired.

  5. #5
    Join Date
    Jul 2011
    Location
    India
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    43

    Re: I need to reinstall Grub 2, but how?

    This is quite long but worked for me

    1. Boot to the LiveCD Desktop (Ubuntu 9.10 or later).
    2. Open a terminal - Applications, Accessories, Terminal.
    3. Determine your normal system partition - (the switch is a lowercase "L")

    sudo fdisk -l
    * If you aren't sure, run

    df -Th. Look for the correct disk size and ext3 or ext4 format.
    4. Mount your normal system partition:
    * Substitute the correct partition: sda1, sdb5, etc.

    sudo mount /dev/sdXX /mnt # Example: sudo mount /dev/sda1 /mnt
    5. Only if you have a separate boot partition:
    * sdYY is the /boot partition designation (for example sdb3)
    *sudo mount /dev/sdYY /mnt/boot
    6. Mount the critical virtual filesystems:

    sudo mount --bind /dev /mnt/dev
    sudo mount --bind /proc /mnt/proc
    sudo mount --bind /sys /mnt/sys
    7. To ensure that only the grub utilities from the LiveCD get executed, mount /usr

    sudo mount --bind /usr/ /mnt/usr
    8. Chroot into your normal system device:

    sudo chroot /mnt
    9. If there is no /boot/grub/grub.cfg or it's not correct, create one using

    update-grub
    10. Reinstall GRUB 2:
    *Substitute the correct device - sda, sdb, etc. Do not specify a partition number.

    grub-install /dev/sdX
    11.Verify the install (use the correct device, for example sda. Do not specify a partition): sudo grub-install --recheck /dev/sdX

  6. #6
    Join Date
    Jun 2008
    Location
    Up state NY Southern Tier
    Beans
    266
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: I need to reinstall Grub 2, but how?

    Deleted post. Started new thread


    Shobuz99
    Last edited by Shobuz99; January 24th, 2013 at 03:51 PM. Reason: started new thread

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