How to Reinstall and Update Grub 2 with a Ubuntu Live CD

I had Windows 7 + Ubuntu 12.04 (Precise Pangolin) installed on my PC. But I needed to develop applications to Windows Phone 8. Since the SDK for Windows Phone 8 only works perfectly under Windows 8, I had to upgrade my Windows 7 installation to Windows 8. After the upgrade, and when I reboot my PC, I noticed that the GRUB won’t appear any more. The reason is Grub 2 gets overridden when you install Windows or another Operating System. But It can be fixed. In order to make Ubuntu control the boot process back again, you just need Reinstall (Repair/Restore) Grub using a Ubuntu Live CD. This is how it should be done :

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