Tips: It’s best to follow along with an AI assistant so you understand each step and avoid accidentally breaking your system.

Windows 11 + Linux (Ubuntu) dual-boot — removing Linux and keeping only Windows.

This guide assumes the Linux boot entry uses EFI + GRUB.

Restore the Windows Bootloader

On a dual-boot system, startup normally presents a menu to choose between Windows and Linux. Once Linux is removed, that menu is no longer needed — the system should boot directly into Windows by default.

1. Boot into Windows, open an administrator PowerShell or Command Prompt, and run:

   bcdedit /enum firmware

   Check whether any entries for ubuntu or grub appear.

2. Write the Windows boot files back to the EFI partition:

   mountvol S: /s
   bcdboot C:\Windows /s S: /f UEFI

3. After the command completes, restart and enter your BIOS/UEFI settings. Move Windows Boot Manager to the top of the boot order.

Delete the Linux Partitions

1. Open Disk Management (also labeled “Create and format hard disk partitions”).
2. Locate the Linux partitions, right-click each one, and select Delete Volume. The partition should turn black, indicating Unallocated space.
   1. If a partition turns green instead, right-click the green border/outline and choose Delete Partition / Delete Extended Partition. Once deleted, it will become black Unallocated space.

Some Linux-related partitions (such as “UBUNTU BOOT”) may not allow Delete Volume from within Disk Management. In that case, use the command line:

Open a terminal as administrator:

diskpart
list disk
select disk 1 // Assuming the Linux partition is on disk 1 — adjust based on your setup
list partition

This displays the partition list for disk 1. Assuming the partition to delete is partition 2:

select partition 2
delete partition override

The override flag forces deletion of protected partitions. After deletion, type exit to quit diskpart.

Create a New Volume

1. Right-click the Unallocated space → New Simple Volume
2. Leave the size at the maximum default
3. Assign a drive letter (e.g., D: or F:)
4. Format as NTFS and check Perform a quick format
5. Click Finish