Software⏱️ 3 min read📅 2026-06-04

How to Fix: Windows 10 upgrade kills grub and boot-repair doesn't help

Windows 10 upgrade kills grub and boot-repair doesn't help

Quick Answer: Try reinstalling GRUB from the Ubuntu liveUSB, then update-grub to see if it resolves the issue.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The error 'Windows 10 upgrade kills grub and boot-repair doesn't help' affects users who have upgraded to Windows 10 from an earlier version of Windows or Linux on their partitioned laptop. This issue can be frustrating as it prevents the user from choosing which operating system to boot intoduring startup. In this guide, we will walk you through the steps to troubleshoot and resolve this problem.

The error is particularly frustrating because it can cause confusion for users who are not familiar with the process of dual-booting or using a live USB to repair their GRUB configuration. Fortunately, there are several methods that can be used to fix this issue, and we will outline them below.

💡 Why You Are Getting This Error

  • The primary reason why Windows 10 upgrades can kill GRUB is due to the way Windows handles its boot process. When you upgrade to Windows 10, it can overwrite or modify the existing boot configuration on your laptop, including the GRUB menu. This is because Windows uses a different boot loader than Linux, and when you install Windows 10, it replaces the old boot loader with its own.
  • An alternative reason for this issue could be due to the use of secure boot. If secure boot is enabled on your laptop, it can prevent the GRUB menu from appearing during startup. However, in this case, since secure boot is disabled, this should not be a problem.

🔧 Proven Troubleshooting Steps

Reinstalling GRUB and updating the boot configuration

  1. Step 1: Boot into your Ubuntu live USB and open a terminal. Run the command `sudo mount /dev/sda1 /mnt` to mount the root partition of your laptop.
  2. Step 2: Next, run the command `sudo arch -i386 chroot /mnt /bin/bash` to enter the chroot environment. This will allow you to modify the GRUB configuration without affecting the rest of the system.
  3. Step 3: Run the command `update-grub` to update the GRUB configuration and include both Linux and Windows boot managers.

Using a different GRUB version

  1. Step 1: Boot into your Ubuntu live USB and open a terminal. Run the command `sudo apt-get install grub-efi-amd64-signed` to update the GRUB package to a newer version that supports UEFI boot.

🎯 Final Words

To summarize, if you are experiencing the error 'Windows 10 upgrade kills GRUB and boot-repair doesn't help', try reinstalling GRUB and updating the boot configuration or using a different GRUB version. If these methods do not work, it may be necessary to seek further assistance from a Linux expert or Windows support specialist.

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