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Table of Contents
Partition preparation: Leave space for Ubuntu
Create Ubuntu boot USB drive
BIOS settings and installation order
Boot problems after installation
Home Computer Tutorials System Installation How to dual boot Windows 11 and Ubuntu

How to dual boot Windows 11 and Ubuntu

Jul 01, 2025 am 12:08 AM
Dual system

When installing dual systems, you need to pay attention to partitioning, installation order and BIOS settings. 1. Partition preparation: Use disk management tools to compress at least 25GB (50GB or more) of unallocated space to Ubuntu without formatting; 2. Make a boot U disk: Use Rufus to write Ubuntu ISO to at least 8GB U disk; 3. BIOS settings: Restart and enter the BIOS (usually press F2, Del or Esc), turn off Secure Boot, and set the U disk as the first boot item; 4. Install Ubuntu: Select "Something else" to custom partition, create a new ext4 mount point/ and occupy the remaining space, and build a swap partition equal to the memory size. The boot loader defaults to select /dev/sda; 5. Boot fix: If there is no system selection interface after restart, use Ubuntu Live USB to execute commands to install Boot Repair fixes GRUB. The steps of the entire process are clear, the key is not to delete partitions randomly or to close Secure Boot.

How to dual boot Windows 11 and Ubuntu

Installing a dual system is actually not that complicated, but the details need to be paid attention to. The principle of dual booting for Windows 11 and Ubuntu is to use the computer's boot manager to choose which system to boot. The key points are partition arrangement, installation order and BIOS settings. Just follow the steps and the success rate is very high.

How to dual boot Windows 11 and Ubuntu

Partition preparation: Leave space for Ubuntu

First free up a piece of "unallocated space" in Windows for Ubuntu installation. Ubuntu requires at least 25GB, 50GB or more is recommended. You can use the disk management tool that comes with Windows to compress a partition.

How to dual boot Windows 11 and Ubuntu
  • Open "This Computer", right-click "Manage" → Disk Management
  • Find the partition you want to shrink (such as D drive or E drive)
  • Right-click → “Compressed Volume”
  • Enter the size of space you want to compress (for example 50GB = 51200MB)

Note: Do not format this space, it will handle it yourself when installing Ubuntu.


Create Ubuntu boot USB drive

You need a USB drive of at least 8GB, as well as an ISO file for Ubuntu (LTS version recommended). The production method is very simple:

How to dual boot Windows 11 and Ubuntu
  • Download Rufus Tools (without installation)
  • Insert the USB drive and turn on Rufus
  • Select the ISO file and the target USB drive
  • Click "Start" to wait for the writing to complete

After completion, plug the USB drive into the computer you want to install the system.


BIOS settings and installation order

Restart the computer, enter the BIOS settings (usually press F2, Del, or Esc keys when powering on), and find the startup item settings:

  • Set the USB drive as the first startup item
  • Turn off Secure Boot (Safe Boot)
  • If it is a new computer, the default may be UEFI mode, just keep it

After saving and restarting, you should enter the Ubuntu installation interface.

During the installation process, select " Something else " to customize the partition. At this time, you will see the unallocated space that has been compressed just now. The operation is as follows:

  • Create a new ext4 partition, select / on the mount point, and the size is recommended to fill the remaining space
  • Create a new swap partition (swap), the size is generally equal to the memory size (for example, if 16GB of memory is divided into 16GB swap)
  • Just select the default installation location of the bootloader (usually /dev/sda )

Continue the installation, set the username and password, and wait for it to be done.


Boot problems after installation

Sometimes, after restarting, you directly enter Windows, and the interface to select the system does not appear. This is because Windows overwrites GRUB boot. Solution:

  • Enter Ubuntu Live USB (boot with USB drive again)
  • Open the terminal and execute the following command to fix GRUB:
 sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt update
sudo apt install -y boot-repair && boot-repair

Then use the Boot Repair tool to automatically fix it, which usually solves the problem.


Basically that's it. The whole process seems to have many steps, but each step is not difficult. The point is not to delete partitions randomly, and do not skip Secure Boot to close the step. After Ubuntu is installed, it can also upgrade the version through the system's own "software update" version, which does not affect Windows.

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