Getting debian apt infrastucture to auto-query /etc/apt/sources.list.d/ #(linuxcnc.list is already there as are others) raspberrypi.list (which contains) deb [arch=armhf,arm64 signed-by=/usr/share/keyrings/raspberrypi.gpg.key] http://archive.raspberrypi.org/debian bookworm main deb-src [arch=armhf,arm64 signed-by=/usr/share/keyrings/raspberrypi.gpg.key] http://archive.raspberrypi.org/debian bookworm main raspian.list deb [arch=armhf signed-by=/usr/share/keyrings/raspbian.public.key] http://archive.raspbian.org/raspbian bookworm contrib non-free rpi deb-src [arch=armhf signed-by=/usr/share/keyrings/raspbian.public.key] http://archive.raspbian.org/raspbian bookworm contrib non-free rpi NOTES ABOUT 'arch=armhf' and raspbian.org I'm very rusty on linux and have zero familiarity with arm[32/64 - Pi versions etc]. It seemed that raspbian.org ONLY had armhf because I think that failed until I added it but I could totally be wrong. The raspian.org source also might NOT provide anything usefull for those to aren't using the RaspblianOS. Debian specific locations for apt updates: https://archive.raspberrypi.com/debian/ (the debian directory seems to be required) Getting keyfiles: cd /use/share/keyrings wget http://archive.raspberrypi.com/debian/raspberrypi.gpg.key wget https://archive.raspbian.org/raspbian.public.key That 'should' do it and if raspbian.org winds up having to value everyone could skip it.