@@ -1785,7 +1785,7 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {

 			hasData := devices.hasImage("data")

 			if !doInit && !hasData {

-				return errors.New("Loopback data file not found")

+				return errors.New("loopback data file not found")

 			}

 			if !hasData {

@@ -1818,7 +1818,7 @@ func (devices *DeviceSet) initDevmapper(doInit bool) error {

 			hasMetadata := devices.hasImage("metadata")

 			if !doInit && !hasMetadata {

-				return errors.New("Loopback metadata file not found")

+				return errors.New("loopback metadata file not found")

 			}

 			if !hasMetadata {