FIX: Windows 10 Ubuntu dual boot not working' By: Lily Smith
4 minute read

Many people use a dual boot setup on their PCs depending on their requirements and need. Some use both Ubuntu and Windows 10 because both have their pros and cons. Ubuntu, like many other non-Windows operating systems, does support dual booting. Windows 10, on the other hand, usually ships with settings that are not optimal for dual boot setups.

GRUB (the acronym for GRand Unified Bootloader) is the bootloader which is used Ubuntu, to manage the operating systems installed on your computer. Basically, it is the software that looks at the operating systems installed on your PC and allows you to choose which one to start after switching on the machine. Most of the problems are related to GRUB, so if you are unable to boot into Grub and the system boots directly to Windows repeatedly, you are going to find below some solutions to this problem.

You can use this guide to fix the following Windows 10-Ubuntu issues:

  • Dual boot option not showing in Windows 10
  • GRUB menu not showing in Ubuntu
  • Ubuntu won’t dual boot with Windows 10

SOLVED: There is no GRUB on Windows 10 Ubuntu dual boot

  1. Repair from Windows – Command Prompt
  2. Disable Fast Boot
  3. Use Boot Repair tool
  4. Windows 10 and Ubuntu are installed in different mode

Solution 1: Repair from Windows – Command Prompt

The simplest way to try to solve this issue is by using the Command Prompt from Windows. In order to do this, please use the steps described below:

  1. In Windows go to menu and search for Command prompt
  2. Right click on Command Prompt and choose the option Run as administratorcommand prompt run as administrator
  3. Copy and paste the command bcdedit /set {bootmgr} path EFIubuntugrubx64.eficommand prompt efi ubuntu
  4. Restart your computer

— RELATED: FIX: Can’t Boot Windows 10 After Installing Ubuntu

Solution 2: Disable Fast Boot

You can also try to deactivate fast boot function of Windows 10 to access the GRUB menu. To do so, please follow the steps below:

  1. Access Control Panel
  2. Search for the term power in the search bar at the top right
  3. Click on Change what the power buttons dochange what the power buttons do
  4. Click on the Change settings currently unavailablecontrol panel power options
  5. Uncheck the item Turn on fast start up (recommended)turn on fast start up
  6. press Save Changes to save the settings

Solution 3: Use the Boot Repair Tool

The Boot Repair Tool is a small software that can solve most of the boot related problems. In order to install it and use it:

  1. Boot into your operating system
  2. Enter the following commands:
    sudo add-apt-repository -y ppa:yannubuntu/boot-repair
    sudo apt-get update
    sudo apt-get install -y boot-repair && boot-repair
  3. After the installation is complete, you can launch Boot Repair tool from the apps menu
  4. It will do some scanning so let it finish its job
  5. Then a screen will appear which will be saying recommended repair based on the scan
  6. After choosing recommended updates, it will start the repair
  7. Open the terminal and copy and paste the highlighted command in terminal one by one.
  8. Select yes by using arrow keys or tab buttons and hit enter to select
  9. in Boot Repair Tool screen hit forward
  10. Copy the command mentioned there and paste it into terminal and hit enter and let it do the job
  11. If prompted some options to configure where to install GRUB Choose yes and then hit enter
  12. Use spacebar to select an option and TAB to navigate through options
  13. After you finish installing GRUB, you can close Terminal
  14. select the forward option in Boot Repair Tool screen
  15. Select Yes for every option regarding confirmation
  16. a successful confirmation message will appear on the screen
  17. restart your computer

— RELATED: Download and install Tails OS on Windows 10 PCs

Solution 4: Windows and Ubuntu are installed in different modes

It is not possible to dual boot two operating systems if they are installed in different modes – one in UEFI mode and the other one in BIOS Legacy mode. Therefore, to solve the problem and restore the dual boot you have to convert the installation of Ubuntu to the same mode in which Windows is installed.

In order to solve this, you can use the Boot Repair Utility and you will need a live bootable DVD of your installed operating system. Afterwards, you can follow one of the steps below, depending on your situation.

  1. To convert Ubuntu to UEFI mode you need to start Boot Repair and activate the panel with the Advanced options, then select the GRUB Position tab, put the check on separate Partition/boot/efi and click Apply.
  2. To convert Ubuntu to BIOS Legacy mode, start Boot Repair and activate the panel with Advanced Options, then select the GRUB Position tab, uncheck the separate Partition/boot/efi item and click Apply.

Afterwards, enter into the UEFI firmware configuration panel and choose whether to start the computer in UEFI or Legacy mode.

We hope that one of the solutions described above helped you solve the dual booting problems and now you are welcomed by the familiar Grub screen.



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