use Linux Mint. When I try to restart apache displays next message. Job for apache2.service failed because the control process exited with error code. See “systemctl status apache2.service” and “journalctl -xe” for details.
HERE IS THE SOLUTION
you need to Kill the process which acquired port 80. You can find that easily with following command :-
sudo netstat -ltnp | grep ':80'
This will return something like :-
tcp 0 0 127.0.0.1:80 0.0.0.0:* LISTEN 1588/aolserver4-nsd
for above case Process number 1588 acquired port 80 , you need to kill that process 1588.
sudo kill -9 1588
Now you can start your apache
Solution 2
go to /etc/apache2/ports.conf and uncomment Listen 80