I have a trying to install Ubuntu 12.04 server LTS on a brand new computer with no operating system currently on it. I am using a USB flash drive to install Ubuntu. Whenever it starts to install Grub into /dev/sda, I keep getting "Grub /dev/sda failed. This is a fatal error" message. How do I correct this issue so that Grub will install into the MBR? Any help will be appreciated.