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I had installed a Ubuntu 12.04 and Fedora 17 dual boot on my system. During the installation I had installed Ubuntu first and Fedora later. Fedora had recognized Ubuntu and added it to the GRUB OS selection list. Afterwards I installed some routine updates on my Ubuntu and after that I am just not able to see the GRUB OS selection anymore when I boot. I am unable to understand what happened, both Fedora and Ubuntu use GRUB 2.0. Also it seems Ubuntu is not able to recognize other existing linux operating systems; because in the beginning I had installed Fedora first and Ubuntu later, but Ubuntu did not recognize Fedora at all, while Fedora recognized Ubuntu when I installed the other way round.

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Update: Ubuntu 12.04 uses GRUB 1.99 while Fedora uses GRUB 2.0. Maybe that is a reason –  ksinkar Jan 29 at 7:35
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1 Answer 1

Try installing the Grub Customizer with

sudo apt-get install grub-customizer

When you open the app, it shows all the detected OS's (as well as old kernel versions). You can tick/untick the boxes to show/hide options at bootup.

It may be possible that Fedora is hidden. If so, you can easily fix it with the customizer.

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