Computer doesn't boot after installing Ubuntu 12.04 for dual booting with Windows 7

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http://askubuntu.com – I installed Ubuntu 12.04 in my computer without problems, but after rebooting i got the following error: Error: No such partition grub rescue> I am a novice with ubuntu and any detailed instructions to the problem will be highly appreciated. I ran boot repair as per the following: sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt-get update sudo apt-get install -y boot-repair boot-repair It did not work: I received the same GRUB rescue error. From boot-repair I received the following log. http://paste.ubuntu.com/1068460/ (HowTos)