diff --git a/pkg/kubectl/kubectl.go b/pkg/kubectl/kubectl.go
index 13ff22ef094..0066f3e845d 100644
--- a/pkg/kubectl/kubectl.go
+++ b/pkg/kubectl/kubectl.go
@@ -46,10 +46,10 @@ func GetKubeClient(config *client.Config, matchVersion bool) (*client.Client, er
 		clientVersion := version.Get()
 		serverVersion, err := c.ServerVersion()
 		if err != nil {
-			return nil, fmt.Errorf("Couldn't read version from server: %v\n", err)
+			return nil, fmt.Errorf("couldn't read version from server: %v\n", err)
 		}
 		if s := *serverVersion; !reflect.DeepEqual(clientVersion, s) {
-			return nil, fmt.Errorf("Server version (%#v) differs from client version (%#v)!\n", s, clientVersion)
+			return nil, fmt.Errorf("server version (%#v) differs from client version (%#v)!\n", s, clientVersion)
 		}
 	}
 
@@ -92,7 +92,7 @@ func LoadNamespaceInfo(path string) (*NamespaceInfo, error) {
 // SaveNamespaceInfo saves a NamespaceInfo object at the specified file path.
 func SaveNamespaceInfo(path string, ns *NamespaceInfo) error {
 	if !util.IsDNSLabel(ns.Namespace) {
-		return fmt.Errorf("Namespace %s is not a valid DNS Label", ns.Namespace)
+		return fmt.Errorf("namespace %s is not a valid DNS Label", ns.Namespace)
 	}
 	data, err := json.Marshal(ns)
 	err = ioutil.WriteFile(path, data, 0600)
diff --git a/pkg/kubectl/resource_printer.go b/pkg/kubectl/resource_printer.go
index 48b573f00f8..ab95e5adb72 100644
--- a/pkg/kubectl/resource_printer.go
+++ b/pkg/kubectl/resource_printer.go
@@ -51,7 +51,7 @@ func GetPrinter(format, templateFile string, defaultPrinter ResourcePrinter) (Re
 		}
 		tmpl, err := template.New("output").Parse(templateFile)
 		if err != nil {
-			return nil, false, fmt.Errorf("Error parsing template %s, %v\n", string(data), err)
+			return nil, false, fmt.Errorf("error parsing template %s, %v\n", string(data), err)
 		}
 		printer = &TemplatePrinter{
 			Template: tmpl,
@@ -62,14 +62,14 @@ func GetPrinter(format, templateFile string, defaultPrinter ResourcePrinter) (Re
 			var err error
 			data, err = ioutil.ReadFile(templateFile)
 			if err != nil {
-				return nil, false, fmt.Errorf("Error reading template %s, %v\n", templateFile, err)
+				return nil, false, fmt.Errorf("error reading template %s, %v\n", templateFile, err)
 			}
 		} else {
 			return nil, false, fmt.Errorf("templatefile format specified but no template file given")
 		}
 		tmpl, err := template.New("output").Parse(string(data))
 		if err != nil {
-			return nil, false, fmt.Errorf("Error parsing template %s, %v\n", string(data), err)
+			return nil, false, fmt.Errorf("error parsing template %s, %v\n", string(data), err)
 		}
 		printer = &TemplatePrinter{
 			Template: tmpl,
@@ -157,16 +157,16 @@ func (h *HumanReadablePrinter) Handler(columns []string, printFunc interface{})
 
 func (h *HumanReadablePrinter) validatePrintHandlerFunc(printFunc reflect.Value) error {
 	if printFunc.Kind() != reflect.Func {
-		return fmt.Errorf("Invalid print handler. %#v is not a function.", printFunc)
+		return fmt.Errorf("invalid print handler. %#v is not a function.", printFunc)
 	}
 	funcType := printFunc.Type()
 	if funcType.NumIn() != 2 || funcType.NumOut() != 1 {
-		return fmt.Errorf("Invalid print handler." +
+		return fmt.Errorf("invalid print handler." +
 			"Must accept 2 parameters and return 1 value.")
 	}
 	if funcType.In(1) != reflect.TypeOf((*io.Writer)(nil)).Elem() ||
 		funcType.Out(0) != reflect.TypeOf((*error)(nil)).Elem() {
-		return fmt.Errorf("Invalid print handler. The expected signature is: "+
+		return fmt.Errorf("invalid print handler. The expected signature is: "+
 			"func handler(obj %v, w io.Writer) error", funcType.In(0))
 	}
 	return nil
@@ -317,7 +317,7 @@ func (h *HumanReadablePrinter) PrintObj(obj runtime.Object, output io.Writer) er
 			return resultValue.Interface().(error)
 		}
 	} else {
-		return fmt.Errorf("Error: unknown type %#v", obj)
+		return fmt.Errorf("error: unknown type %#v", obj)
 	}
 }