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How to reinstall the grub boot manager on Ubuntu Linux

My new Compaq CQ20 noteobook has a “recovery button” feature which I really haven’t gotten to checkout. The other day while setting up Ubuntu, I inadvertently pressed on the button which resulted to a “missing operating system” message when I got my notebook restarted. That recovery button should really be moved to a separate location or better yet have a disable feature option. I know that my data is still intact and that maybe the boot sector was the only area on the disk that was affected.

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