I have two Raspberry Pi 4s. Both had Raspbian 10 (buster) installed on them initially, and both have now had in-place upgrades to Raspberry Pi OS 11 (bullseye). I'm aware that the original and new OSes aren't quite the same beast (Raspbian vs. Raspberry Pi OS). For the most part, this went fine, but has left some unfortunate artifacts. The first (that I know of, there may be many others) is /etc/apt/sources.list.d/raspi.list, which includes one active line: deb http://archive.raspberrypi.org/debian/ buster main Notice that this is pointing to buster. Which made me do some digging: # for package in $(dpkg-query -W --showformat='${Package}\n'); do if apt info $package 2> /dev/null | grep -q buster ; then echo $package ; fi ; done chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg-extra libraspberrypi-bin libraspberrypi-dev libraspberrypi-doc libraspberrypi0 raspberrypi-bootloader raspberrypi-kernel rng-tools-debian These are all packages that are installed from the buster repository, and they seem like some seriously important packages (the kernel? the bootloader?) that are being held back at an older version of the OS. I would rather not re-install the OS, so any suggestions about what's going on or how to fix it (or if that's necessary) would be appreciated. -- Giles https://www.gilesorr.com/ gilesorr@gmail.com