How to Install Ubuntu 12.10 on the GPT?

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http://askubuntu.com – I have installed Win7 first and I was create GPT. Unfortunately, when i try to install Ubuntu 12.10, in the GParted, it just show all my HDD without any partition. In Window I still see the C,D,E.... Why was that happend? Can I fix it or I must format? Please help me, I really want to use Ubuntu. Sorry for my bad English. (HowTos)