Custom signing will do of course, this is just out of curiosity. https://ubuntu.com/blog/how-to-sign-things-for-secure-boot https://ubuntu.com/blog/how-to-sign

Custom signing will do of course, this is just out of curiosity. https://ubuntu.com/blog/how-to-sign-things-for-secure-boot https://ubuntu.com/blog/how-to-sign-things-for-secure-boot