Puppet

patch is below, YMMV

Index: posix.rb
===================================================================
--- posix.rb  (revision 2525)
+++ posix.rb  (working copy)
@@ -65,6 +65,18 @@
             end
         end
     end
+
+    #
+    # Adding this because recent versions of debian have a broken getgrgid()
+    # We want to match either a numeric or nominal value
+    def stubborn_getgrgid(group)
+   Etc.group { |g|
+          if (g.gid == group || g.name == group)
+            return g.gid
+          end
+    }
+    end
+

     # Determine what the field name is for users and groups.
     def idfield(space)
@@ -78,7 +90,7 @@

     # Get the GID of a given group, provided either a GID or a name
     def gid(group)
-        get_provider_value(:group, :gid, group) or get_posix_field(:gr, :gid, group)
+        stubborn_getgrgid(group) or get_provider_value(:group, :gid, group) or get_posix_field(:gr, :gid, group)
     end

     # Get the UID of a given user, whether a UID or name is provided