Ok, I'm getting the parts together to build a new Linux box. One of those parts is my secondary HDD, where my Linux partition lives. I used GRUB as the bootloader in the MBR and everything worked ...

This post provides guidance on the 2-step process to successfully uninstall Linux in Windows 11/10 Dual Boot setup without losing data.

Replacing the Windows bootloader with GRUB2 does require the attacker to have administrator privileges on the system, and so does modifying the GRUB2 configuration file on Linux, but Secure Boot ...

Bootloader gap: Many Linux distributions are at risk There is a security gap in the bootloader shim, which also allows secure booting for non-Windows operating systems.