How to change grub Boot order?

How to Change Grub Boot Order: A Step-by-Step Guide

Understanding Grub Boot Order

Before we dive into the process of changing grub boot order, it’s essential to understand what grub boot order is. Grub is a boot loader that manages the boot process of your computer. It’s responsible for loading the operating system and other essential files. The grub boot order determines which operating system and other files are loaded first.

Why Change Grub Boot Order?

Changing grub boot order can be useful in various scenarios, such as:

Dual-booting: When you have multiple operating systems installed on your computer, you may want to load one operating system before another.

Virtualization: When you’re running multiple virtual machines on your computer, you may want to load the operating system of the virtual machine before the host operating system.

Hardware configuration: You may want to change the grub boot order to prioritize certain hardware devices, such as the network card or the graphics card.

Step-by-Step Guide to Changing Grub Boot Order

Here’s a step-by-step guide to changing grub boot order:

Table of Contents

Step 1: Identify the Current Grub Boot Order

To change grub boot order, you need to identify the current grub boot order. You can do this by:

Checking the grub configuration file: Open the grub configuration file (/etc/grub/grub.cfg) using a text editor.

Using the grub command: Run the grub command with the -q option to display the current grub boot order.

Step 2: Identify the Priority of Each Operating System

Once you have identified the current grub boot order, you need to identify the priority of each operating system. The priority of an operating system is determined by its position in the grub boot order.

Identify the priority of each operating system: Look for the line that specifies the priority of each operating system. This line is usually in the format label value.

Identify the priority of each operating system: For example, if the line is Ubuntu 20.04 1, the priority of Ubuntu is 1.

Step 3: Change the Grub Boot Order

Now that you have identified the priority of each operating system, you can change the grub boot order.

Update the grub configuration file: Open the grub configuration file (/etc/grub/grub.cfg) and update the line that specifies the priority of each operating system.

Use the grub command: Run the grub command with the -q option to display the updated grub boot order.

Example: Changing the Grub Boot Order

Here’s an example of how to change the grub boot order:

# Identify the current grub boot order

grub -q



# Identify the priority of each operating system

Ubuntu 20.04 1

Debian 10 2

Fedora 35 3



# Change the grub boot order

grub -o /etc/grub/grub.cfg -p /boot/grub/grub.cfg -c "label Ubuntu 20.04 { priority 1 } label Debian 10 { priority 2 } label Fedora 35 { priority 3 }"



# Update the grub configuration file

sudo update-grub

Tips and Tricks

Use the grub command with the -q option: This option displays the current grub boot order without loading the operating system.

Use the grub command with the -p option: This option specifies the path to the grub configuration file.

Use the grub command with the -c option: This option specifies the grub configuration file.

Use the update-grub command: This command updates the grub configuration file.

Common Issues and Solutions

Error: unable to find the grub configuration file: This error occurs when the grub configuration file is not found. Check the file path and try updating the grub configuration file.

Error: unable to update the grub configuration file: This error occurs when the grub configuration file is not updated successfully. Check the file path and try updating the grub configuration file again.

Conclusion

Changing grub boot order can be a useful feature in various scenarios. By following the steps outlined in this article, you can change the grub boot order and prioritize your operating systems. Remember to update the grub configuration file and use the grub command with the -q option to display the current grub boot order.

Additional Resources

Grub Official Website: https://www.grub.grub.com/

Grub Documentation: https://www.grub.grub.com/docs/grub.html

Linux Documentation: https://www.linux.org/docs/