Fix wrong reduce

install/variables/autopartition.py

@@ -869,7 +869,7 @@ class VariableClAutopartitionDeviceSize(ReadonlyVariable):
                                  _in=devices))
         # TODO: remove set 10G
         #return str(1024*1024*1024*10)
-        return str(reduce(operator.add,sizeDevice))
+        return str(reduce(operator.add,sizeDevice,0))
 
 class VariableClAutopartitionFreeSize(ReadonlyVariable):
     """