You need to have Ubuntu Live CD or Live USB. Normal session can be used to repair the grub. Boot using your Ubuntu Live CD or Live USB, while booting choose Try Ubuntu.
Once booted then open a terminal, and run the following command one by one to install the boot repair.
To add boot-repair to the repository
sudo add-apt-repository ppa:yannubuntu/boot-repair
To Update your repository
sudo apt-get update
To install boot-repair
sudo apt-get install -y boot-repair
Once Installation complete run boot-repair on terminal by typing the following command or select it by System->Aministration->Boot Repair.
boot-repair
NOTE: Update the Boot Repair if its newer version is available.
Source: http://www.howopensource.com/2012/05/reinstall-recover-grub-from-ubuntu-12-04-live-cd-usb/
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