I think I mentioned very early on. If you use the 64 bit version of 12.10 it will install with Windows 8. Some have reported it works even if secure boot is on, but you may have to have it off to install. Some have had issues and a few have major issues which seem to be more with UEFI bugs.
Some also have incorrectly installed Ubuntu in BIOS mode where it uses MBR, but Boot-Repair will fix by uninstalling grub-pc (for BIOS) and installing grub-efi (for UEFI). Your install of Ubuntu is not different other than a couple of minor settings.
The only remaining major bug is that grub2's os-prober still creates BIOS chain load entries to boot Windows which will not work. Boot-Repair will add entries that do work.
It is my understanding that grub2 2.00 that is currently with 12.10 will also then be included in 12.04with next point release in Jan. so it will boot with secure boot systems. Current 12.04 will install to UEFI, but not secure boot (although I did just see some updates to grub2 1.99 that said something about secure boot?).
Systems need quick boot or fast boot turned off in UEFI settings.