Comment 2 for bug 1354013

You tried to install the boot loader ( grub ) to the first disk ( /dev/sda ), but this disk contains Windows only and is partitioned using GPT. To install grub to a GPT partitioned disk in a bios booting PC like yours, it requires a 1 mb bios_grub partition on the disk. You will need to either create such a partition on that disk, or install grub to the other disk where you installed Ubuntu to, and change your bios boot order to boot from that drive.