Comment out ubuntu-fr as it is not a general search engine

searx/settings.yml

@@ -337,10 +337,12 @@ engines:
 #    number_of_results : 5
 #    timeout : 3.0
 
-  - name : ubuntuwiki
-    engine : doku
-    shortcut : uw
-    base_url : 'http://doc.ubuntu-fr.org'
+# Doku engine lets you access to any Doku wiki instance:
+# A public one or a privete/corporate one.
+#  - name : ubuntuwiki
+#    engine : doku
+#    shortcut : uw
+#    base_url : 'http://doc.ubuntu-fr.org'
 
 locales:
     en : English