Comment 1 for bug 591202

This seems like the same bug that I've noticed when using the Maverick mini.iso. If you install Ubuntu via a flash drive (created with Unetbootin or Ubuntu Startup Disk Creator) grub2 installs to /dev/sda which is the flash drive that you are installing FROM, not the drive you are installing TO. This then makes the system unbootable and could leave lots of inexperienced users very disenfranchised.

Ideally, grub should give you the option of what drive to install it to during the Ubuntu installation process.

To fix this in the short term, leave the flash drive you installed FROM in the PC and once Ubuntu and been installed when the PC reboots, choose to boot from the flash drive, this will then boot the newly installed Ubuntu installation. Then, login and type sudo fdisk -l to find out the name of the hardrive you need grub2 installed to. Finally install grub2 by issuing sudo grub-install /dev/sdX where /dev/sdX is the name of the drive that the fdisk command gave you.