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So, I can't boot into windows at the moment, and in order to fix this problem I need to access Advanced Options which I can do by pressing F8 in the windows boot loader. However, I have grub currently as the default boot loader. How would I be able to change the bootloader through Linux terminal? Any ideas appreciated. Thanks!

Navjot Singh
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2 Answers2

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Try this command

sudo gedit /etc/default/grub

and change the GRUB_DEFAULT to what windows boot loader is.

A penguin
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  • This changes the entry that is highlighted by default in Grub. It doesn't change the bootloader. – Nathan Osman Nov 05 '15 at 02:58
  • whoops..., kinda got confused – A penguin Nov 05 '15 at 02:59
  • Well, i think you need a flash drive to boot windows. That is sad truth. I learned this the hard way: I tried to install ubuntu and boot windows. You need either a flash drive or you have to rewrite the MBR to boot windows :( – A penguin Nov 05 '15 at 03:27
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Have you try boot-repair?

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair

Run boot-repair, choose Recommended Repair. At least this will make you can boot to your Windows by Grub.

Then if you want to change the default bootloader, you can use EasyBCD to change the default bootloader. See this for the documentation.

adadion
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  • Thank You! I haven't tried this out yet but something like EasyBCD was EXACTLY what i was looking for. I will try the boot repair first though! – Navjot Singh Nov 06 '15 at 02:37
  • Is there a CentOS equivalent to the commands? Also, EasyBCD can only be installed on windows. I found kgrubeditor as a linux alternative. – Navjot Singh Nov 06 '15 at 18:58
  • @NavjotSingh EasyBCD is Windows software. I mean, try using boot-repair first, to make you able to boot into your Windows. Then on Windows, use EasyBCD to change the default boot loader. So my post is 2 step work. For CentOS, you should ask in Unix & Linux – adadion Nov 09 '15 at 09:11