How to fix Grub Rescue – 

From within rescue mode.

  • Command: ls

It will list all your drives and partitions, just like:

(hd0)    (hd0,msdos2)   (hd0,msdos1)

  • If you don’t know your Ubuntu boot partition, check them one by one:

ls (hd0,msdos2)/

ls (hd0,msdos1)/

 

When you hit the right one, you’ll get a line mentioning ‘ lost + found ‘, & more importantly ‘boot’, and so on.

  • Assuming (hd0,msdos2) is the Ubuntu partition:

set prefix=(hd0,2)/boot/grub

set root=(hd0,2)

insmod normal

normal

  • Now you’ll be able to boot into Ubuntu. Once you do, execute the following commands on a terminal (ctrl+alt+t):

sudo update-grub

sudo grub-install /dev/sda

or you can simply boot from your windows cd/USB and after booting press ctrl/alt + F10..
enter

bootrec /fixmbr

bootrec /fixboot

bootrec /scanos

bootrec /rebuildbcd

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