@@ -56,20 +56,6 @@ func (nnr NetworkNameError) Error() string {

 // Conflict denotes the type of this error

 func (nnr NetworkNameError) Conflict() {}

-// UnknownNetworkError is returned when libnetwork could not find in its database

-// a network with the same name and id.

-type UnknownNetworkError struct {

-	name string

-	id   string

-}

-

-func (une *UnknownNetworkError) Error() string {

-	return fmt.Sprintf("unknown network %s id %s", une.name, une.id)

-}

-

-// NotFound denotes the type of this error

-func (une *UnknownNetworkError) NotFound() {}

-

 // ActiveEndpointsError is returned when a network is deleted which has active

 // endpoints in it.

 type ActiveEndpointsError struct {

@@ -24,7 +24,7 @@ func TestErrorInterfaces(t *testing.T) {

 		}

 	}

-	notFoundErrorList := []error{&UnknownNetworkError{}, ErrNoSuchNetwork(""), ErrNoSuchEndpoint("")}

+	notFoundErrorList := []error{ErrNoSuchNetwork(""), ErrNoSuchEndpoint("")}

 	for _, err := range notFoundErrorList {

 		assert.Check(t, is.ErrorType(err, errdefs.IsNotFound))

 	}

@@ -16,6 +16,7 @@ import (

 	"time"

 	"github.com/containerd/log"

+	"github.com/docker/docker/errdefs"

 	"github.com/docker/docker/libnetwork/datastore"

 	"github.com/docker/docker/libnetwork/driverapi"

 	"github.com/docker/docker/libnetwork/internal/netiputil"

@@ -1021,7 +1022,7 @@ func (n *Network) delete(force bool, rmLBEndpoint bool) error {

 	n, err := c.getNetworkFromStore(id)

 	if err != nil {

-		return &UnknownNetworkError{name: name, id: id}

+		return errdefs.NotFound(fmt.Errorf("unknown network %s id %s", name, id))

 	}

 	// Only remove ingress on force removal or explicit LB endpoint removal

@@ -1054,7 +1055,7 @@ func (n *Network) delete(force bool, rmLBEndpoint bool) error {

 		// Reload the network from the store to update the epcnt.

 		n, err = c.getNetworkFromStore(id)

 		if err != nil {

-			return &UnknownNetworkError{name: name, id: id}

+			return errdefs.NotFound(fmt.Errorf("unknown network %s id %s", name, id))

 		}

 	}