apache2: no listening sockets

[michael <linux@networkingnewsletter.org.uk>]

I wanted to run Apache2 on my box (so as to experiment with various
Wiki) which has a dynamic IP. I'm happy for it to be only a local web
server. I've set

michael@manchester-campaigns:~$ less /etc/apache2/ports.conf Listen
127.0.0.1:80
michael@manchester-campaigns:~$

but I get the following error


michael@manchester-campaigns:~$ sudo /etc/init.d/apache2 restart
Forcing reload of web server (apache2)...apache2: Could not reliably
determine the server's fully qualified domain name, using 127.0.0.1 for
ServerName
httpd (no pid file) not running
apache2: Could not reliably determine the server's fully qualified
domain name, using 127.0.0.1 for ServerName
(98)Address already in use: make_sock: could not bind to address
127.0.0.1:80
no listening sockets available, shutting down
Unable to open logs
 failed!
michael@manchester-campaigns:~$

All helpful pointers to solving this are most welcome!
Thanks, Michael