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Dual boot on already-installed system

asked 2017-01-16 15:54:35 -0600

missriaelaine gravatar image

updated 2017-01-16 16:38:42 -0600

mattdm gravatar image

Hi all,

I'm a newbie here so please bear with me, I am running Fedora 25 Cinnamon and Windows 7 each on separate hard drives in a Dell E6420 laptop.

At the moment I am using the F12 function to interrupt the boot sequence if I want to run Windows (Linux is on the first hard drive).

On my old desktop PC many years ago I did manage to get grub configured to have both OS's showing on bootup but I can't for the life of me remember how I did it.

Can anyone advise (in simple terms, please..!) I have seen guides on how to set this up when installing Linux, but not how to edit grub on an already-installed system.

Thanks in advance,

Ria in Aberdeen

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answered 2017-01-17 23:00:02 -0600

florian gravatar image

You should be able to fix this by simply updating grub. Boot your Fedora installation, then follow this guide:

Make sure you follow the steps in the right section. Note: Bios-based systems are different from (U)EFI-based systems.

It's good to install os-prober (sudo dnf install os-prober) and see if Fedora detects your Windows installation (it will create a grub.conf entry for it (sudo os-prober).

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answered 2017-01-16 22:30:05 -0600

xmetax gravatar image

This should work for updating the GRUB config for OS's that are already installed, simply use the steps outlined for your configuration and follow the steps:

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Asked: 2017-01-16 15:54:35 -0600

Seen: 288 times

Last updated: Jan 17 '17