--- python-apt-1.4.0~beta3ubuntu1/aptsources/sourceslist.py	2017-04-23 12:02:14.000000000 -0700
+++ sourceslist.py	2017-12-22 10:31:06.864418357 -0800
@@ -303,7 +303,7 @@ class SourcesList(object):
                 yield source
 
     def add(self, type, uri, dist, orig_comps, comment="", pos=-1, file=None,
-            architectures=[]):
+            architectures=[], disabled=False):
         """
         Add a new source to the sources.list.
         The method will search for existing matching repos and will try to
@@ -315,7 +315,7 @@ class SourcesList(object):
         # we can modify it later
         comps = orig_comps[:]
         sources = self.__find(lambda s: set(s.architectures) == architectures,
-                              disabled=False, invalid=False, type=type,
+                              invalid=False, type=type,
                               uri=uri, dist=dist)
         # check if we have this source already in the sources.list
         for source in sources:
@@ -339,7 +339,7 @@ class SourcesList(object):
                 source.comps = uniq(source.comps + comps)
                 return source
         # there isn't any matching source, so create a new line and parse it
-        line = type
+        line = type if not disabled else '# ' + type
         if architectures:
             line += " [arch=%s]" % ",".join(architectures)
         line += " %s %s" % (uri, dist)