Upon trying to install Ubuntu 13.10 x64 in EFI mode on /dev/sda8 over an earlier (also failed) 13.04 64bit partition, I selected the partitioning option:
"Replace existing Ubuntu 13.04 installation"
Thinking that ONLY /dev/sda8 would be wiped, not the entire 500GB disk.
Clearly that was a misunderstanding....a disastrously unclear one, it turned out. Now ALL my other GPT partitions are gone: the OEM Windows 8, all the previous data/programs/user files, system, recovery, boot, 16GB Windows image rollback/restore, boot, EFI, etc.
No more "Windows Bootloader" option after F12 key upon BIOS bootup. Of course, No Ubuntu boot option is present either. Never was, always failed in mid-installation, even with 13.04 and 12.04 64bit versions. (Yet this is a new 6GB AMD laptop with new harddisk, four different USB keys or DVD install disks tested to rule out media failures, etc.)
In Live mode, off a USB key, Gparted only shows three new partitions, automatically made by the Ubuntu installer. The EFI boot area, the Ubuntu main, and swap at end. None of which are important to me in comparison to the old partitions and structure.
Question, How can I roll back to the previous GPT partition table? Where on the disk might be backups stored, and for the previous Windows bootloader too? What could make this recovery process easiest, since I cannot easily remove the harddisk from the laptop, due to the way it's built? Even if 7GB+ of random data might already be damaged.