Cannot start XAMPP on Ubuntu 11.10

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http://askubuntu.com – When I try to start XAMPP with sudo /opt/lampp/lampp start command it gives me a message like this. Starting XAMPP for Linux 1.7.7... XAMPP: Another web server daemon with SSL is already running. XAMPP: Starting MySQL... XAMPP: Couldn't start MySQL! XAMPP: XAMPP-ProFTPD is already running. XAMPP for Linux started. What is this and how can I find what was this another web server daemon with SSL. How to stop this server ? (HowTos)