apt-mark showmanual shows you all manually installed packages and apt-mark auto marks stuff as automatically installed. The list of manually installed packages

apt-mark showmanual shows you all manually installed packages and apt-mark auto marks stuff as automatically installed. The list of manually installed packages is effectively the "world". The new solver takes inspiration from apk in that it marks the world/manually installed packages the root of the dependency problem (hence why they can't be removed by the solver itself, only manually).