Starting apache fails (could not bind to address 0.0.0.0:80)

Worked for me running this command:

fuser -k -n tcp 80

It may be skype or nginx using the port 80.

Try shutting down skype, or running: sudo /etc/init.d/nginx stop

I had the same error, and just want to confirm that running

    sudo netstat -ltnp | grep ':80'

helped me indicate that Hiawatha webserver was in the way of Apache2.

Removing Hiawatha fixed the issue (sudo dpkg --purge hiawatha). Ubuntu 12.04.2 server.

I had the same problem

For me, apache was already running but it was running the wrong way.

Killing processes didnt work because a daemon kept reinstantiating it.

apachectl stop   

resolved the issue.

Try this, it works for me…

sudo netstat -ltnp | grep ':80'

This would return the following:

tcp6 0 0 :::80 :::* LISTEN 1047/apache2

Then

sudo kill -9 1047

Then I was able to restart Apache and everything was working fine.