make install-xinetd
 make install-daemon-config
  service xinetd restart
  mkdir /usr/local/nagios/etc/servers
  a2enmod rewrite
   a2enmod cgi
 htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin  // user:nagiosadmin, pass:admin
ln -s /etc/apache2/init.d/nagios /etc/rcS.d/S99nagios
 service nagios start
 service apache2 restart