I want to install Ubuntu 12.04 in a laptop with a Windows 8 preinstallation in UEFI mode.
I followed the instructions here and I use a 64bit iso of 12.04.2.
When I boot from USB (in UEFI mode) the OEM installation is not availble (there are only 3 options: "try ubuntu, install ubuntu and check disk", while if I boot the same iso in legacy mode the OEM installation is availble through the F4 options.
Also note that the 13.04 has availble the OEM installation from booting in UEFI mode.
It is important to install the LTS version because we prepare an image for use in >500 laptops and also we can not ignore the UEFI mode because we must have the dual boot with the existing Windows 8 preinstallation.