Something else is already listening on port 80 (apache or other webserver usually). The command below should tell you who is listening on that port (run as root).
root@webserver:~# netstat -l --numeric-ports -p |grep 80
tcp6 0 0 :::80 :::* LISTEN 3114/httpd
In general (on forums), it's not appreciated if you bump your post within 24 hours (give it chance to go around the world).
Further at LQ, you post get's bumped automatically for two days if it does not receive replies. As LQ also provides an option to search for 0 reply posts (which some people use), you've just shot yourself in the foot.