Use nix-channel --add https://nixos.org/channels/nixos-20.09 nixpkgs
to name the channel, then --remove nixos-20.09
, --update
and then you can use your new stable default.
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Use nix-channel --add https://nixos.org/channels/nixos-20.09 nixpkgs
to name the channel, then --remove nixos-20.09
, --update
and then you can use your new stable default.