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When not using flakes, nixos-rebuild switch --upgrade is equivalent to apt update; apt upgrade. The equivalent to dist-upgrade is nix-channel add $NEW-CHANNEL-URL nixos and then performing a regular update.
When not using flakes,
nixos-rebuild switch --upgradeis equivalent toapt update; apt upgrade. The equivalent todist-upgradeisnix-channel add $NEW-CHANNEL-URL nixosand then performing a regular update.