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sudo apt-get --purge remove apache2
sudo apt-get autoremove
sudo apt-get install apache2
sudo /etc/init.d/apache2 restart
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sudo systemctl start apache2
sudo systemctl stop apache2
sudo systemctl restart apache2
sudo systemctl status apache2
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sudo apt-get --purge remove apache2
sudo apt-get autoremove
sudo apt-get install apache2
sudo /etc/init.d/apache2 restart