How to restart apache2 when I get a pid conflict?
Thanks to @douggro who found the answer.
Find the processus id of Apache2 with :
pidof apache2
Kill the process(es) :
sudo kill -9 <pid>
Then you can start Apache2 as usually :
sudo service apache2 start
UPDATE
If sudo kill -9 <pid>
doesn't work, just try sudo kill <pid>
!