In the sites-available directory
$ sudo mv www.yoursite.com www.yoursite.com.conf.
In the sites-enabled directory
$ sudo unlink www.yoursite.com
$ sudo ls -s ../sites-available/www.yoursite.conf.
Then you may need to rerun a2ensite on each site.
Also could be a change in the default virtual host directory:
Default Virtual Host
If your Apache configuration file is replaced during the upgrade, the location of your default virtual host will change from /var/www to /var/www/html. You may have to disable the default virtual host again, if you don’t want it. We have a specific directory identified in the .conf file to get around this.
Headless web server still seems to work. Arrow is pointing the the leds connected to the parallel port. The leds can do light demos or even present messages about the server status.