Mengatasi ERROR pada Apache2 di Ubuntu "Set NameServer"

Pesan Error yang muncul jika kita memasukan perintah untuk merestart service apache pada ubuntu 14.04 LTS/Linux Mint 17.x

     * Restarting web server apache2                                          

    AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message
                                                                                 [ OK ]

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