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I first installed windows 7 in a partition. Then installed ubuntu in another partition. But i am not able to choose between those 2. It is directly going into windows 7. Please

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Did you install Ubuntu using an USB drive? If so, GRUB may be installed in the USB rather than the hard drive. Try booting with the same USB drive plugged in, and edit the question with the results. – user68186 Oct 26 '12 at 13:37

You need Ubuntu 10.10 livecd for repairing grub boot loader . Here assuming the Ubuntu partition is sda7. Boot up ubuntu from the livecd,open terminal and run:

sudo fdisk -i

and see what is your linux partition and note it I assume it sda7 here.

mount /dev/sda7 /mnt

mount /dev/sda7 /mnt/boot

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

mount --bind /proc /mnt/proc

mount --bind /dev /mnt/dev

mount --bind /sys /mnt/sys

chroot /mnt update-grub

umount /mnt/sys

sudo reboot

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