dual boot - Ubuntu LiveUSB doesn't recognize my Windows 8 installation

I have a laptop with UEFI (secure boot disabled) with Windows 8.

I am trying to install Ubuntu 12.10 or 12.04 along side Windows 8 on my primary hard drive, which uses GPT. I am only presented with the option to erase the disk and install so the install alongside windows option does not appear.

How can I install Ubuntu without erase my Windows system?