Solve Problem AH00558 When Restarting Apache2

Im trying to restart apache2 using this command:

sudo service apache2 restart

sudo /etc/init.d/apache2 restart

But get below error:

AH00558: apache2: Could not reliably determine the servers fully qualified domain name, using 127.0.1.1.

So, how to fix this problem?

Edit file apache2.conf from directory /etc/apache2/ by use this following command:

nano /etc/apache2/apache2.conf

Add the following syntax in the last row of apache2.conf file:

ServerName localhost

So that error doesnt disappear.

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