1. Turn on your computer.
2. Insert your Ubuntu LiveCD into the CD drive.

3. Restart the computer. It should boot directly from the CD drive after about 30 seconds. Wait for the Ubuntu desktop to load on your screen.
4. Click on the terminal window icon and wait for it to load. The icon looks like a black rectangle.
5. Type the following commands at the terminal prompt one line at a time, pressing the 'Enter' button on the keyboard after each line you enter:$ sudo fdisk --l$ sudo mount /dev/sda1 /mnt$ sudo mount /dev/sda2 /mnt/boot$ sudo mount /dev/sda3 /mnt/var$ sudo mount --bind /dev /mnt/dev$ sudo mount --bind /proc /mnt/proc$ sudo mount --bind /sys /mnt/sys$ sudo chroot /mnt
6. Select the drive that you have Ubuntu installed on by using the arrow buttons on your keyboard and pressing the spacebar.
7. Type the following command exactly as you see it written here, and then press the 'Enter' button on the keyboard:$ dpkg-reconfigure grub-pc
8. Hit the 'Ctrl' key and the 'D' key on the keyboard at the same time. Only hold them down for a second or two, no longer.
9. Type the following commands at the terminal prompt one line at a time, pressing the 'Enter' button on the keyboard after each line you enter:$ sudo umount /mnt/dev$ sudo umount /mnt/proc$ sudo umount /mnt/sys$ sudo umount /mntEXIT
10. Remove the LiveCD and reboot your computer.