Comment 17 for bug 506670

I don't think you need to start all over again. You can just create the partition in gparted and retry. The error messages are not friendly though.

"Executing 'grub-install /dev/sda' failed.

This is a fatal error."

This should tell you why it failed, and give the actual error message. I had to discover that I needed to do a "chroot /target" before manually running grub-install or it would give an unrelated error.

Also, regarding "The debug log file from your installation would help us a lot but includes the password you used for your user when installing Ubuntu. " Why doesn't it just remove the password before uploading?