Postfix prompts not happening

I am following the tutorial to install postfix in Ubuntu 16.04, but it stops on the first screen. Any idea? I just installed Lemp Ubuntu 16.04 with success. Using Putty to run the commands. Can’t get out of the first screen and then i can’t login because of the processes running inside… i think.

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Yez. When i run the first sudo command it shows the list and the ‘ok’ in the end. I will try your suggestion. Thank you for caring.

Is it this tutorial? What do you mean by “it stops on the first screen”? First screen of what, when you did what?