How To Upgrade Raspberry Pi OS to Debian Bookworm from Bullseye
The Raspberry Pi Foundation released new images for its Raspberry Pi OS that are based on Debian Bookworm. This is a major update that switches from X11 to Wayland by default with new apps, replacements for previous default apps, as well as other necessary adjustments.
Most of you might want to upgrade your existing Raspberry Pi OS installations based on Debian GNU/Linux 11 “Bullseye” to Debian GNU/Linux 12 “Bookworm”, so here’s how to do it in a few easy steps.