Everything seems fine but for
You will need to Re-install grub to the MBR from the live disk with /dev/sda5 being the root partition.
============================= Boot Info Summary: ==============================
=> GAG is installed in the MBR of /dev/sda
From the live disk
sudo mount /dev/sda5 /mnt
sudo grub-install --root-directory=/mnt /dev/sda
And then reboot the machine, grub menu should come up now.
Note windows 7 loader is listed in grub.cfg so re-installing grub will also give access to windows. To access an external os later on just plug it in then in 10.04 run
and it should be picked up as bootable by Lucid and added to the menu. To remove from the menu unplug and use the "update-grub" command abve again.
Edit: this is where i got most of the info http://ubuntuforums.org/showthread.php?t=1195275
.particularly section 13.