Ubuntu_Terminal [duplicate]

I am trying to run the command

sudo nix develop

which leads to the following output

warning: Using saved setting for 'extra-sandbox-paths = /opt' from ~/.local/share/nix/trusted-settings.json.warning: Using saved setting for 'extra-substituters = https://nixbld.m-labs.hk' from ~/.local/share/nix/trusted-settings.json.warning: Using saved setting for 'extra-trusted-public-keys = nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc=' from ~/.local/share/nix/trusted-settings.json.root@SI-000072:/#

I am somewhat puzzled by the warning, since the folder ~/.local does not exist (I am aware that it is a hidden folder).Since the command does not seem to finish correctly, does anyone have an idea how to deal with this warning?And what is the meaning of

/#

in the last line?

root@SI-000072:/#

Thanks=)