Trying to Install Ubuntu 12.10 on Asus X401U help needed

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http://askubuntu.com – I have a SATA with 320gb running Windows 8 I am trying to dual boot. I tried Installing It through a USB but received this message. Executing 'grub-install /dev/sda2' failed. I tried using the original sda but I can't add to it. If pictures of the partitions are needed they can be posted. I have 82Gb ready for Ubuntu but every attempt to install it has failed. Any help would be appreciated (HowTos)