EFI SUPPORT: Download the efi iso if you need efi support here: https://sourceforge.net/projects/debian-mate/files/current/
This is debian 11 mate.
Built with debian tools, packages, and currently based on the stable branch (Bullseye). Here I try not to use software from outside of the debian repositories.
For all intents and purposes, this is just debian paired with the mate desktop environment with a lot of hardware support taken care of.
Debian mate doesn't force you into new conformancy...