So this step on the "Ubuntu setup for Plutus Playround" Cant work.
mkdir ~/.config/nix echo 'substituters = https://hydra.iohk.io https://iohk.cachix.org https://cache.nixos.org/' >> ~/.config/nix/nix.conf echo 'trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= iohk.cachix.org-1:DpRUyj7h7V830dp/i6Nti+NEO2/nhblbov/8MW7Rqoo= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=' >> ~/.config/nix/nix.conf
what should i do? trying to create a .config folder don't work either. (my coding and linux level is low)