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When I try to start the Apache Webserver, I get the following:
root@ubuntu:/home/user/Desktop/install_ispconfig# /etc/init.d/apache2 restart
* Forcing reload of apache 2.0 web server... (98)Address already in use: make_sock: could not bind to address [::]:80
no listening sockets available, shutting down
Unable to open logs
you could use a port scanner such as "nmap" which can be already installed on your distro but not totally sure as i dont use your distro type. if it has you can type this into the console and it would tell your what ports are listening and the service running on that port. eg
nmap -sT -O localhost
if that doesn't work then try a netstat, this specific command would give you specific info on port 80 as requested.
if nmap says the port is closed, it means that nothing is running (listening) there.
Try the following: Change the listening port in the Apache Config (httpd.conf) to another port (i.e 8088) and try to restart it.
If this works, you have a conflict on port 80.
If this doesnt help, its something else.