Install Ubuntu dual boot on a windows 8 preinstalled Acer Aspire V3-571G-9686

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http://askubuntu.com – I'm trying to install Ubuntu on a Acer Aspire V3-571G-9686, this but I've not been able to do it. Here a list of what I have tried/do: 1- Create a LiveUSB with Ubuntu 12.10 2- Turn off the fast startup option on the Windows power management tool. 3- Change the boot order to 1-> Usb 2->CD/DVD 3-> Windows (Booting or something like that) 4- Put de Flash Drive in and restart. It recognizes the LiveUSB and i select "Try Ubuntu", it works fine. But when I try to install Ubuntu does not detect the existing W8(don't show the option "install along side"). Among other things i shrink one of the p (HowTos)