How to Repair, Restore, or Reinstall Grub 2 with a Ubuntu Live CD or USB Grub 2 typically gets overridden when you install Windows or another Operating System. To make Ubuntu control the boot process, you need Reinstall (Repair/Restore) Grub using a Ubuntu Live CD. Warning Using the sudo command, especially from a Live CD can do serious damage to your system. Read all instructions and confirm you