I installed Windows 8 and Ubuntu 12.10 on a 3TB GPT disk in UEFI mode.
Both can boot up OK.
Both operating systems created their ntries in the UEFI boot menu, there's an "ubuntu" and a "Windows 8" entry.
The boot order can be altered in the motherboard's UEFI setup.
I'd like to boot "ubuntu" first, because I set up GRUB 2 to be able to boot both systems.
But whenever I boot Windows 8, it changes the boot order …