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How to reinstall grub in ubuntu.

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After the reinstall of windows grub disappeared. I think this is a big problem for all of us.
So…

Boot the livecd.
Start a terminal.
and type

sudo -i
grub
find /boot/grub/stage1         // this will print something like (hd0,1) this is the disk that you have to write next
root (hd0,1)
setup (hd0)
quit

then restart your machine and now your old grub menu should be there.

Thanks