SHELL

restart apache ubuntu

# Restart Apache 2 server on Linux/Unix
sudo service apache2 restart

# Start Apache 2 server on Linux/Unix
sudo service apache2 start

# Stop Apache 2 server on Linux/Unix
sudo service apache2 stop

restart apache

sudo systemctl restart apache2
# or
sudo service apache2 restart

linux apache restart

sudo service apache2 start
sudo service apache2 restart
sudo service apache2 stop

OR 

sudo /etc/init.d/apache2 start
sudo /etc/init.d/apache2 restart
sudo /etc/init.d/apache2 stop

restart apache ubuntu

# Restart apche 2 server.
sudo service apache2 restart 
or
sudo systemctl restart apache2


# Gracefully reloading is a bit faster, and there's no downtime
sudo service apache2 reload

restart apache

# CentOS/RedHat
sudo service httpd restart

# Debian/Ubuntu
sudo service apache2 restart

how to restart apache ubuntu

# by this command you can restart your apache2 server on Linux
sudo service apache2 restart
# by this command you can Start your apache2 server on Linux
sudo service apache2 start
# by this command you can Stop your apache2 server on Linux
sudo service apache2 stop