avoid a warning

webmails/roundcube/start.py

@@ -40,7 +40,7 @@ os.system("mkdir -p /data/gpg /var/www/html/logs")
 os.system("touch /var/www/html/logs/errors.log")
 os.system("chown -R www-data:www-data /var/www/html/logs")
 os.system("chmod -R a+rX /var/www/html/")
-os.system("ln -s /var/www/html/index.php /var/www/html/sso.php")
+os.system("ln -sf /var/www/html/index.php /var/www/html/sso.php")
 
 try:
     print("Initializing database")