GRUB loader won't start in secure boot

 If you're experiencing issues with GRUB not starting in Secure Boot mode, it could be due to several reasons. Secure Boot is a security feature that can prevent unsigned or improperly signed bootloaders and kernels from running. Here are steps to resolve this issue:


1. **Check Secure Boot Status**:

   First, make sure that Secure Boot is enabled in your BIOS/UEFI settings. You'll need to access your system's firmware settings during the boot process, usually by pressing a key like F2, F12, or Del. Confirm that Secure Boot is turned on.


2. **GRUB Configuration**:

   Ensure that GRUB is properly configured and signed for Secure Boot. The GRUB bootloader needs to be signed using a Secure Boot key. You can typically do this with tools like `shim` or `sb-sign`. Verify that your GRUB configuration is set to load signed kernels.


3. **Kernel Signing**:

   The kernel that GRUB loads also needs to be signed. Check if your kernel is signed with an appropriate Secure Boot key. You can use tools like `sbsign` to sign your kernel if it isn't already.


4. **Use a Distribution with Secure Boot Support**:

   Some Linux distributions have better support for Secure Boot than others. Consider using a distribution known for its Secure Boot compatibility, such as Ubuntu or Fedora.


5. **Check for Updates**:

   Ensure your system's firmware, GRUB, and kernel are up to date. Sometimes, updates include fixes for Secure Boot issues.


6. **Key Management**:

   If you're managing your own Secure Boot keys, make sure they are correctly set up and enrolled in your system's firmware.


7. **Disable Secure Boot for Testing**:

   As a temporary measure for debugging, you can disable Secure Boot in your BIOS/UEFI settings. This will allow you to boot into your system without Secure Boot and investigate the issue. However, it's not a recommended long-term solution for security reasons.


8. **Consult Documentation**:

   Check the documentation and support forums for your specific Linux distribution and hardware. They may have guidance on configuring Secure Boot for your system.


9. **Consult Your Hardware Manufacturer**:

   Some hardware manufacturers have specific quirks related to Secure Boot. Check if your hardware manufacturer provides any support or documentation.


Remember that Secure Boot is a security feature designed to protect your system from booting unauthorized or tampered code. While it can be restrictive, it is there for a reason. Always be cautious when configuring or disabling Secure Boot, and ensure you understand the implications for system security.

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