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How To Fix “Operating System Not Found” Error When Booting from USB in Windows 8

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In this article, we will explore various solutions to resolve the “Operating System Not Found” error when booting from a USB in Windows 8. This error can be frustrating, but with the right steps, it can be resolved.

Quick Answer

To fix the "Operating System Not Found" error when booting from a USB in Windows 8, you can try enabling the Compatibility Support Module (CSM) in your system’s BIOS/UEFI setup, installing grub-efi if you’re using Ubuntu, switching to a different USB device, trying a different ISO version, and ensuring that the ISO is properly written to the USB drive.

Enable CSM in EFI

The first solution to consider is enabling the Compatibility Support Module (CSM) in your system’s BIOS/UEFI setup. This can usually be found under the “Boot” or “System” tab.

  1. Restart your computer and press the key to enter the BIOS setup. This key varies by manufacturer, but it’s usually F2, F10, F12, or DEL.
  2. Navigate to the “Boot” or “System” tab.
  3. Look for an option related to “Boot Mode” or “UEFI/BIOS Boot Mode”. Change this setting to “Legacy” or enable CSM.
  4. Save the changes and exit the BIOS setup.

Enabling CSM or changing the boot mode to Legacy can solve compatibility issues between the USB device and the UEFI firmware.

Install grub-efi

If you have successfully booted into Ubuntu but are unable to see the GRUB menu with both Ubuntu and Windows options, you can install grub-efi.

Open a terminal and run the following command:

sudo apt-get install grub-efi

The sudo command allows you to run commands with administrative privileges. apt-get is a package handling utility in Ubuntu. install is the command to install a package, and grub-efi is the package we want to install.

After the installation, reboot your computer and change the boot mode back to UEFI in the BIOS setup. You should then see the GRUB menu with options for both Ubuntu and Windows.

Switch USB Devices

Sometimes, certain USB devices may not be compatible or may have formatting issues. If you are still encountering the error, try using a different USB device. Switching to a different USB device, even if it has the same capacity and format, might resolve the issue.

Try a Different ISO Version

In some cases, using an older version of the Ubuntu ISO may work when newer versions encounter compatibility issues. You can try downloading an older version of Ubuntu from the official Ubuntu releases archive and see if it resolves the problem. Once installed, you can perform incremental upgrades to reach the latest version.

Properly Writing the ISO to USB

It is important to ensure that the ISO is properly written to the USB drive. Use a reliable tool like Rufus or Etcher to create a bootable USB drive from the ISO file. These tools ensure that the ISO file is correctly written to the USB drive, making it bootable.

By following these steps, you should be able to resolve the “Operating System Not Found” error when booting from a USB in Windows 8. If you continue to encounter issues, it may be beneficial to seek professional help or contact your system manufacturer for further assistance.

What does the “Operating System Not Found” error mean?

The "Operating System Not Found" error typically indicates that the computer is unable to find a valid operating system to boot from.

Why am I encountering this error when booting from a USB in Windows 8?

There can be several reasons for this error, including compatibility issues between the USB device and the UEFI firmware, incorrect boot mode settings, or problems with the ISO file on the USB.

How do I enable the Compatibility Support Module (CSM) in my system’s BIOS/UEFI setup?

To enable CSM, restart your computer and enter the BIOS setup by pressing the key specified by your manufacturer (usually F2, F10, F12, or DEL). Navigate to the "Boot" or "System" tab and look for an option related to "Boot Mode" or "UEFI/BIOS Boot Mode". Change this setting to "Legacy" or enable CSM, save the changes, and exit the BIOS setup.

What if I have successfully booted into Ubuntu but cannot see the GRUB menu with both Ubuntu and Windows options?

If you cannot see the GRUB menu, you can install grub-efi. Open a terminal and run the command sudo apt-get install grub-efi. After installation, reboot your computer and change the boot mode back to UEFI in the BIOS setup. The GRUB menu with options for both Ubuntu and Windows should then be visible.

What should I do if I am still encountering the error after trying the above solutions?

If the error persists, try using a different USB device as the current one may not be compatible or have formatting issues. Additionally, you can try downloading an older version of Ubuntu from the official Ubuntu releases archive and see if it resolves the problem. Lastly, ensure that the ISO is properly written to the USB drive using a reliable tool like Rufus or Etcher.

What if none of the solutions mentioned in the article work for me?

If you have tried all the solutions mentioned and are still encountering the error, it may be beneficial to seek professional help or contact your system manufacturer for further assistance. They might be able to provide specific guidance based on your system configuration.

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