Insert ubuntu CD
Select "Try ubuntu without any change to current  system" option
Open Accessories >terminal
Type: sudo  fdisk -l
This command will list all partions in hard disk
find  the partion ,in my case it is sda2
sudo mount /dev/sda2 /mnt
sudo  mount --bind /dev /mnt/dev
sudo chroot /mnt
update-grub
grub-install  /dev/sda2
grub-install --recheck /dev/sda2
sudo umount /mnt/dev
sudo  umount /mnt
Now reboot, you will find that grub only contain  ubuntu
Dont panic!  we are not yet done
Boot to ubuntu
Open  Accessories >terminal
Type: sudo update-grub
Now  reboot
 
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