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Eray
Asked: 2011-11-22 05:33:12 +0800 CST

Restore Grub - Cannot Find File

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I had Ubuntu and Win 7 on different partitions. And then i formatted partition which containing Win 7 and reinstall Win 7. And then dual boot screen disappeared. I'm following tohuwawohu's answer.

My HDD partition is sda5 which Ubuntu installed.

Now i'm trying to boot my computer, after BIOS loading , i'm getting GRUB command prompt screen (screenshot) directly.

TO solve it, i'm following this steps .

REsult is like this : enter image description here

grub2

3 Answers

  1. I assume those steps relate to grub, not grub2. With grub2, the file structure has changed, so there are no more stage file in the grub directory. In this thread, under #13, you will find a description how to restore grub2 from a LiveCD. EDIT2: It has the following steps (credits drs305):

    1. Boot the Ubuntu Live CD (Try without installing).

    2. From the Desktop, open a terminal - Applications, Accessories, Terminal.

    3. Determine your normal system partition - sudo fdisk -l (That is a lowercase 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:

      sudo mount /dev/sdXY /mnt

      • If you aren't sure if you mounted the correct partition, once it's mounted run "nautilus /mnt" to inspect the partition. If it is the correct partition, you should see the normal Ubuntu folders such as /bin, /boot, /etc, /home, etc
      • Example: sudo mount /dev/sda1 /mnt
      • Note: The partition to mount is normally the partition on which Ubuntu was installed: sda1, sdb5, etc. If you have a separate /boot partition, use the device on which the /boot partition is located. Grub 2 works best when installed in the MBR of the drive to which BIOS boots. Also remember that you mount the partition (including the number) in this step, but you do not include the partition number when you run the "sudo grub-install" command later.
      • Note: GRUB 2 counts the first drive (X) as "0", but the first partition (Y) as "1"

    5. Only if you have a separate boot partition:

      sudo mount /dev/sdXY /mnt/boot

      with sdXY being your /boot partition designation.

    6. Reinstall GRUB 2:

      sudo grub-install --root-directory=/mnt /dev/sdX

      Do NOT include the partition number.

    7. Example:

      sudo grub-install --root-directory=/mnt /dev/sda

      • Note: Substitute the device on which Ubuntu was installed - sda, sdb, etc. Do NOT specify a partition number.

    8. Unmount the partition *:

      sudo umount /mnt

      • Note: If you mounted a separate /boot partition, unmount it first:

        sudo umount /mnt/boot

    9. Reboot.

    10. After reboot: Update the grub menu using sudo update-grub

    Here's another description. Good luck!

    EDIT1: Some more information is also available in the Ubuntu Wiki on grub2.

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  2. Best Answer

    I had a similar error , how I fixed it was like this: I used Boot repair, a tool to fix grub

    Boot into the LiveCD and use the following commands

    sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair

    and launch Boot repair, choosing the right options from the GUI

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