[ubuntu] Grub file deleted

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http://ubuntuforums.org – Hello everyone, as I'm new to Ubuntu, I make a lot of mistakes. I was installing ruby on rails but could not install it properly. So I thought to uninstall it and re-install. But during the uninstall i was asked for confirmation to delete the grub file. In the UI that asked I was asked, I was confused whether yes or no was selected. Although I meant to confirm as NO, but the messages in the terminal are stating that removing grub2 .... and like wise. So I think grub file is deleted so I'm very much afraid to reboot my machine. I have tight schedule to complete a project. So what can I do now s (Hardware)