How to fix XAMPP Starting Apache...fail. (Debian Based)

user@ubuntu:~$ sudo /opt/lampp/lampp start [sudo] password for user: Starting XAMPP for Linux 7.1.8-0... XAMPP: Starting Apache...fail. XAMPP: Another web server is already running. XAMPP: Starting MySQL...ok. XAMPP: Starting ProFTPD...ok. user@ubuntu:~$ sudo /etc/init.d/apache2 stop [ ok ] Stopping apache2 (via systemctl): apache2.service. user@ubuntu:~$ sudo /opt/lampp/lampp stop user@ubuntu:~$ sudo /opt/lampp/lampp start Please subscribes my channel ;)