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How do i set up grub OS loader.

asked 2016-08-09 08:15:11 -0500

sigurdsk gravatar image

Hi! How can i safetly set up grub loader to boot both my Fedora and my Windows at system startup? At the moment the windows boot loader display 4 different versions of Fedora, witch i dont know why, and also windows ultimate. So, i was wondering if it is safe to install and configure grub or maybe some other boot loader witch might be better to boot my Fedora workstation as well as my Windows 10 OS's. Please provide me with enough information to do so without harming my system.

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answered 2016-08-09 10:30:15 -0500

f24live5 gravatar image

So, if I understand you correctly, you are currently using the Windows bootloader? (meaning you probably installed Fedora before Windows)? Are you able to boot to both systems? If so, what are you hoping to accomplish by installing Grub?

If you want to proceed, I believe you should be able to install Grub from your current Fedora install. You can find information about Grub here.

NOTE: The commands given here may make your system unbootable, please use them at your own risk

Before doing anything, I would create and burn a bootable Windows iso using the media creation tool on this page from your Windows partition that you would be able to use to fix your Windows boot manager if anything goes wrong (download the tool and see "Using the tool to create installation media (USB flash drive, DVD or ISO file) to install Windows 10 on a different PC (click to show more or less information)" on the same page)

After that, I would boot into Fedora, open a terminal, and run the following command

grub2-install /dev/sda

I would then reboot and see if both Windows and Fedora are listed. In the case that Windows is not listed, I would go back into Fedora and run

grub2-mkconfig -o /boot/grub2/grub.cfg

Which I believe should create a new config file with a (hopefully) detected Windows entry that you should be able to load upon reboot.

If all fails, and you want to revert, I believe you should be able to boot the Windows image you created earlier, and use the Startup Repair tool to recover (and if that fails, there should be more you can do using the Windows image and selecting a command prompt, I believe this command should work, e.g., bootsect.exe /nt60 C: /mbr )

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answered 2016-08-09 22:41:03 -0500

florian gravatar image

updated 2016-08-09 22:46:31 -0500

IMHO, your boot loader is already Grub, displaying 3 Fedora kernels + Rescue Option + Windows. If you want to configure it (no clue why, all sounds very solid), use grub-customizer or learn the commands that control grub and its config: (and many many Questions and correct Answers on this forum).

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Asked: 2016-08-09 08:15:11 -0500

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Last updated: Aug 09 '16