Cannot boot into Ubuntu after installing Ubuntu 12.04 (with Windows 7 on another partition)

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http://askubuntu.com – I just installed Ubuntu on my desktop which had Windows 7 installed on it. When I restart the machine after completing the installation, It directly loads windows, I don't see the grub menu. I tried using boot-repair using the LiveCD (both recommended fixes AND fixing the MBR), it did not help. What am I missing? I have done this at least 5 other times, on different machines, and have never faced this issue before. (HowTos)