GRUB2 with LUKS It’s a very common setup and poorly documented on the web. I’ll be using Slackware in this example, but GRUB is used in many, many distros. UEFI replaced BIOS years ago. People still call everything BIOS, but if it was made lately, your computer is probably UEFI. GPT replaced MBR years ago as the default partition scheme. MBR refuses to die, but again, most recent systems are GPT.