Why has the Windows 7 boot option disappeared after updating Ubuntu on my dual boot machine?

xyz July 29, 2011
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I updated by Ubuntu with some packages. After that it asked for restart. Then after that, at boot option, Windows 7 option has disappeared. I am no longer able to start Windows 7.

  1. Anonymous
    July 29, 2011 at 1:10 pm

    Well hope that you didnt overwrote windows and still there

    From your Ubuntu desktop,
    open up a terminal and run
    sudo update-grub

    To reinstall Grub, with all the options you had, you'll need a linux live CD or pen. Once in a "live session":
    1.Open a Terminal
    2.Use sudo fdisk -l and locate Ubuntu's partition.
    3.Mount said partition in /mnt (replace XY, with the correct letter & number): •sudo mount /dev/sdaXY /mnt

    4.Reinstall grub (assuming /dev/sda is your main HDD):
    •sudo grub-install --root-directory=/mnt/ /dev/sda