Will be interesting to see if 343 just sucks at making Halo games, or if their engine was holding them back. Or both I suppose.
I hope multiple Halo games confirmed means some singleplayer/coop story stand alone titles. Seperate and quatantined from the online live service multiplayer titles.
Look for the option when installing that is along the lines of "wipe entire drive."
If you want Debian, check out Vanilla OS. They reached a milestone not too long ago, and it's a bulletproof distro. It containerizes most programs, it's immutable, and has atomic updates.
Someone already mentioned, turn off secure boot in your BIOS/uefi settings.