linux - XAMPP: Another web server daemon is already running?

Question

I have painfully analyzed all of yesterday if I had another apache/web-server instance running, with all of these commands

ps aux
ps -e
lsof 
netstat tunap

I DO NOT have another instance of Apache or ANY OTHER server running at port 8080.

Yet, XAMPP gives me this:

XAMPP: Another web server daemon is already running

What should I do?

I also edited httpd.conf to LISTEN to port 9876, and still the same.

Answer 1

 sudo rm /opt/lampp/logs/httpd.pid
// get listen pid
 sudo netstat -nap | grep :80

example of output:

tcp6   0  0 :::80  :::*  LISTEN  14417/httpd

PID is 14417

kill proc

 sudo kill 14417

start/restart lampp server

 sudo /opt/lampp/lampp restart