Ubuntu 12.10 - Windows 8 Dual Boot (Tried boot-repair) - Dual OS option not showing

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http://askubuntu.com – as title says, this is my first time trying ubuntu. I have been trying since last week with continuous googling and searching, but still no luck. I had win8 x64 installed before, then tried installing Ubuntu 12.10 desktop (dual OS option) I tried like 10 times already, everytime it's showing installation complete, but when i restarted and boot from my HDD, dual boot option is not showing, directly to win8 startup I installed win8 on C before. I had a 104gb free drive to install linux to (it's installed already.. but the dual boot option is now showing) In case it helps, Laptop Model : Acer A (HowTos)