How to Remove Ubuntu Entry from EFI and/or Reinstall OpenBSD Boot Loader

Are you encountering issues with your computer's boot loader after uninstalling Ubuntu or trying to reinstall OpenBSD? Don't worry, we've got you covered! In this guide, we will walk you through the steps to remove the Ubuntu entry from your EFI (Extensible Firmware Interface) and reinstall the OpenBSD boot loader. Let's get started!

Before You Begin

Before diving into the process, make sure you have the following:

• A computer running OpenBSD or a Live CD/USB with OpenBSD
• Basic knowledge of using the command line
• Patience and a backup of your important data (just in case)

Removing the Ubuntu Entry from EFI

The first step is to remove the Ubuntu entry from your EFI. Here's how:

1. Boot into OpenBSD or the Live CD/USB with OpenBSD.
2. Open a terminal or console.
3. Run the following command to list all the available EFI boot entries:

This command will display a list of boot entries, including Ubuntu.

4. Identify the entry corresponding to Ubuntu. It usually has a description like "Ubuntu" or "GRUB". Take note of the entry's number.
5. To remove the Ubuntu entry, run the following command, replacing XXXX with the number of the Ubuntu entry:

This command will remove the Ubuntu entry from your EFI.

Reinstalling OpenBSD Boot Loader

Now that the Ubuntu entry has been removed, let's proceed with reinstalling the OpenBSD boot loader:

1. Make sure you are still in the OpenBSD environment or boot into the Live CD/USB with OpenBSD.
2. Open a terminal or console.
3. Run the following command to reinstall the OpenBSD boot loader:

Replace /dev/sdX with the appropriate device identifier for your system. For example, /dev/sda or /dev/nvme0n1.

4. Finally, reboot your computer to test if the OpenBSD boot loader is working correctly.

Congratulations! You have successfully removed the Ubuntu entry from your EFI and reinstalled the OpenBSD boot loader. Your computer should now boot directly into OpenBSD.

Removing the Ubuntu entry from your EFI and reinstalling the OpenBSD boot loader might seem like a daunting task, but by following the steps outlined in this guide, you can easily accomplish it. Remember to double-check the commands and device identifiers to avoid any unintended consequences. If you encounter any issues or have any questions, feel free to seek further assistance from the OpenBSD community or consult a professional.

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