Can't 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. I have 82Gb ready for Ubuntu but every attempt to install it has failed. I have also tried installing it with the windows installer on the Ubuntu website but nothing works.Here is what the partitions look like, http://imgur.com/jd03X http://imgur.com/kSjA1 Any help would be appreciated if im being vague ask and I will try to answer. (HowTos)