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

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 not showing)

In case it helps: Acer Aspire 4752, Intel Core i3, 2.30GHz, 4GB RAM, 64 Bit OS – Windows 8 Pro with Media Center.

This is the URL I got from the boot-repair: http://paste.ubuntu.com/1407018/
(it's not win vista, thou it seems showing so in the link).

Thanks a lot. Any help will be greatly appreciated. I really want to get my Linux installed.