Windows 11 I'm trying to reinstall Windows 11 from Ubuntu via the UEFI boot screen, but I get an error (0xc000014c) when trying to do so from the UEFI setup.

Possible Reasons for the Error:​

• The Windows 11 installation media (ISO file) may not have been created or written to the bootable disk properly.
• The bootloader used by the system could still be recognizing remnants of the Ubuntu installation or conflicting settings.
• UEFI misconfiguration or issues with the partition structure on your drive.

Solutions to Try:​

Step 1: Verify the Windows Installation Media​

• If the ISO was converted to a bootable media using Ubuntu, ensure it was done correctly. Use tools like Rufus or Ventoy (from another Windows system, if available) to create a proper Windows installer on a USB drive.
• Alternatively, you can verify that the ISO is legitimate by redownloading it directly from Microsoft’s official https://www.microsoft.com/software-download/windows11.
  On Ubuntu:
  Use dd or tools like WoeUSB to create the bootable USB.
  
  Code:

  bash
     sudo dd if=/path-to-windows.iso of=/dev/sdX bs=4M status=progress

  Replace sdX with the correct USB device identifier.

Step 2: Set UEFI Firmware Settings​

• Boot into your system’s BIOS/UEFI settings.
• Ensure that:
• Secure Boot is enabled.
• Boot Mode is set to UEFI Only (not Legacy or CSM mode).
• Fast Boot is disabled for troubleshooting.
• Set USB devices or installation media as the first boot priority.
• Check the boot order and confirm that no conflicting entries (e.g., Ubuntu GRUB loader) remain.

Step 3: Prepare the Disk​

• Boot into the installation media and open Command Prompt during the Windows installation process:
• On the installation page, press Shift + F10 to bring up the prompt.
• Run the following commands:
  
  Code:

  bash
     diskpart
     list disk
     select disk 0
     clean
     convert gpt
     exit

  Replace disk 0 with the drive number where Windows will be installed.
  Warning: This will erase ALL data on the disk. Back up anything important beforehand.

Step 4: Repair BCD​

• Boot into the Windows installation USB.
• Choose Repair your computer > Troubleshoot > Advanced options > Command Prompt.
• Run these commands one by one:
  
  Code:

  cmd
     bootrec /fixmbr
     bootrec /fixboot
     bootrec /scanos
     bootrec /rebuildbcd

  If prompted to add an installation to the boot list, type Y.

Step 5: Reinstall Windows​

• After addressing the BCD and partition, restart the system.
• Proceed with a clean Windows 11 installation:
• Select the newly cleaned and converted drive as the installation target.
• Finish the installation process.

If All Else Fails:​

• Double-check the file integrity of the ISO.
• Consider flashing your BIOS/UEFI to the latest version from your motherboard’s manufacturer website to address any firmware issues.
• Provide detailed screenshots or logs for further assistance. If you have used a boot repair tool (from Ubuntu), there might be relevant logs from that tool.

• Check UEFI/BIOS: Ensure it's set to UEFI mode and Secure Boot is off.
• Create a bootable USB: Use Rufus or Windows Media Creation Tool.
• Boot from USB: Restart and select the USB drive from the boot menu.
• Repair boot: In Command Prompt, run:
• bootrec /fixmbr
  bootrec /fixboot
  bootrec /rebuildbcd
  
  
• Check EFI partition: In Ubuntu, check if the BCD file is in the EFI partition.
• Reinstall Windows: If repairs fail, delete Windows partitions and reinstall.

• Check UEFI/BIOS Settings:
  Make sure your firmware is set to boot in UEFI mode. If Secure Boot is enabled, try turning it off as it may interfere with booting from your USB drive.
• Create a Bootable USB:
  Use reliable tools like Rufus or the Windows Media Creation Tool to create a bootable USB drive. Confirm that your USB is formatted with the proper filesystem (FAT32 is recommended for UEFI).
• Boot from the USB:
  Restart your computer and access the boot menu (usually by pressing a key like F12, Esc, or F10, depending on your hardware). Select the USB drive to boot from.
• Repair Boot Configuration (if needed):
  If the boot error persists, boot into the Windows recovery environment via your bootable USB, open Command Prompt, and run the following commands to repair the boot configuration:
  
  Code:

  bootrec /fixmbr
  bootrec /fixboot
  bootrec /rebuildbcd

• Check the EFI Partition:
  In Ubuntu, you can mount the EFI partition to check if the BCD (Boot Configuration Data) file exists and is intact. For example:
  
  Code:

  sudo mount /dev/sdXY /mnt
  ls -l /mnt/EFI/Microsoft/Boot/

  Replace /dev/sdXY with the correct partition identifier for your EFI partition.
• Reinstall Windows:
  If the above repairs don’t work, consider deleting the Windows partitions (after backing up any data) and performing a fresh installation. This ensures that any corrupt boot data from a previous install is removed.