# cat /etc/apache2/conf-enabled/nut.conf

  Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
  AllowOverride All
  Require all granted
  <Files upsset.cgi>
    Allow from all
#    Deny from all
  </Files>
</Directory>
Alias /nut /usr/share/nut/www/
<Directory /usr/share/nut/www>
  Options Indexes FollowSymLinks
  <IfModule mod_dir.c>
    DirectoryIndex index.php index.html
  </IfModule>
</Directory>

sudo a2enmod cgi