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The error Address already in use: make_sock: could not bind to address 188.226.155.119:80 suggests that something else is already binding to port 80. Do you have another web server installed? Visting that IP address, I see an Nginx error page. It sounds like both Nginx and Apache are running and attempting to use port 80. By default, they will both start on boot.
To see if this is the issue, stop Nginx and start Apache with:
sudo service nginx stop
sudo service apache2 start
To disable Nginx from starting automatically, run:
sudo update-rc.d nginx disable