This is my config for NixOs using Gnome + Cosmic desktop environments

So I am using only configuration.nix

• (not necessarily)

sudo su

nix-env git --install

git clone github.com/kevin-hw/nixos-config

• Here u need to delete generated configuration.nix

cd /etc/nixos/

rm -f configuration.nix

• Next, we need to move my config to the folder

cd

cd nixos-config/etc/nixos

mv configuration.nix ~/etc/nixos

• Build ur new DE

nixos-rebuild switch

Congrats!