[ubuntu] non-existing bootloader

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http://ubuntuforums.org – Hello fellow GNU/Linux users. I am running Ubuntu 12.04 LTS with Unity. I have also installed Back Track 5 r3 as a dual boot to Ubuntu. My problem begins at boot, it simply does not show me anything, by that I mean some bootloader where I can pick which OS i wanna boot. So what do i need to do to make this thing working? (Hardware)