I just installed Nagios onto a Ubuntu 7.10 box. The installation went good and I got 0 errors. However, when I go to localhost/nagios, I get the Index of /Nagios page. When I look down the file list I have a html folder that brings me to the Nagios web interface. When I try to click on a menu item on the left side of the page I get an error such as The requested URL /nagios/cgi-bin/status.cgi was not found on this server. Also I was never asked for a login name and password. My Nagios directory is under /var/www if that helps any.
To double check I tried the command make install-webconf again in the apache2 conf.d directory and got make: *** No rule to make target ‘install-webconf’. Stop.