user2688: 
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)

user5818: It’s because the folder .config does not exist yet, so you cannot create the nested folder nix
So you run this instead
mkdir -p ~/.config/nix

2688: <p><a href="https://i.stack.imgur.com/nmvIi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nmvIi.png" alt="there is no .config on my clean ubuntu server" /></a></p>
<p>So this step on the &quot;Ubuntu setup for Plutus Playround&quot; Cant work.</p>
<blockquote>
<p>mkdir ~/.config/nix
echo 'substituters = <a href="https://hydra.iohk.io" rel="nofollow noreferrer">https://hydra.iohk.io</a> <a href="https://iohk.cachix.org" rel="nofollow noreferrer">https://iohk.cachix.org</a> <a href="https://cache.nixos.org/%27" rel="nofollow noreferrer">https://cache.nixos.org/'</a> &gt;&gt; ~/.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=' &gt;&gt; ~/.config/nix/nix.conf</p>
</blockquote>
<p>what should i do? trying to create a .config folder don't work either.
(my coding and linux level is low)</p>
 5818: <p>It’s because the folder .config does not exist yet, so you cannot create the nested folder nix</p>
<p>So you run this instead</p>
<p><code>mkdir -p ~/.config/nix</code></p>
