diff --git a/config/yurtctl-servant/setup_edgenode b/config/yurtctl-servant/setup_edgenode
index 9bea7ae2238..d078e831dcf 100755
--- a/config/yurtctl-servant/setup_edgenode
+++ b/config/yurtctl-servant/setup_edgenode
@@ -33,7 +33,6 @@ spec:
   - name: pki
     hostPath:
       path: __pki_path__
-      path: /var/lib/minikube/certs
       type: Directory
   - name: kubernetes
     hostPath:
@@ -116,11 +115,14 @@ preset() {
 # setup_yurthub sets up the yurthub pod and wait for the its status to be Running
 setup_yurthub() {
     provider=$1
+    declare pki_dir 
     # put yurt-hub yaml to /etc/kubernetes/manifests 
     if [ "$provider" == "minikube" ]; then
+        pki_dir=${MINIKUBE_PKI_DIR}
         yurthub_yaml=$(echo "$YURTHUB_TEMPLATE" | 
             sed 's|__pki_path__|/var/lib/minikube/certs|')
     else
+        pki_dir=/etc/kubernetes/pki
         yurthub_yaml=$(echo "$YURTHUB_TEMPLATE" | 
             sed 's|__pki_path__|/etc/kubernetes/pki|')
     fi 
@@ -137,7 +139,7 @@ setup_yurthub() {
 /api/v1/namespaces/kube-system/pods/yurt-hub-__node_name__ \
             --cert /var/lib/kubelet/pki/kubelet-client-current.pem \
             --key /var/lib/kubelet/pki/kubelet-client-current.pem \
-            --cacert ${MINIKUBE_PKI_DIR}/ca.crt)
+            --cacert ${pki_dir}/ca.crt)
         # yurt-hub pod is not found
         if [ -n "$(echo "$podStat" | grep NotFound)" ]; then                 
             retry=$((retry-1))
@@ -208,7 +210,7 @@ revert_kubelet() {
     # remove openyurt's kubelet.conf if exist
     [ -f $OPENYURT_DIR/kubelet.conf ] && rm $OPENYURT_DIR/kubelet.conf
     # revise the kubelet.service drop-in
-    sed -i "s|--kubeconfig=.*|--kubeconfig=$KUBELET_CONF|g;" $KUBELET_SVC
+    sed -i "s|--kubeconfig=.*kubelet.conf|--kubeconfig=$KUBELET_CONF|g;" $KUBELET_SVC
     log "revised the kubelet.service drop-in file back to the default"
     # reset the kubelete.service
     systemctl daemon-reload
diff --git a/pkg/yurtctl/cmd/convert/convert.go b/pkg/yurtctl/cmd/convert/convert.go
index c6d17cfff98..46a5f320736 100644
--- a/pkg/yurtctl/cmd/convert/convert.go
+++ b/pkg/yurtctl/cmd/convert/convert.go
@@ -10,6 +10,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	appsv1 "k8s.io/api/apps/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/clientcmd"
@@ -185,7 +186,7 @@ func (co *ConvertOptions) RunConvert() error {
 	if err := co.clientSet.CoreV1().ServiceAccounts("kube-system").
 		Delete("node-controller", &metav1.DeleteOptions{
 			PropagationPolicy: &kubeutil.PropagationPolicy,
-		}); err != nil {
+		}); err != nil && !apierrors.IsNotFound(err) {
 		klog.Errorf("fail to delete ServiceAccount(node-controller): %s", err)
 		return err
 	}
diff --git a/pkg/yurtctl/constants/constants.go b/pkg/yurtctl/constants/constants.go
index 9997943010e..5599133e2f4 100644
--- a/pkg/yurtctl/constants/constants.go
+++ b/pkg/yurtctl/constants/constants.go
@@ -63,7 +63,7 @@ spec:
           type: Directory
       containers:
       - name: yurtctl-servant
-        image: openyurt/yurtctl-servant:edge
+        image: openyurt/yurtctl-servant:latest
         command:
         - /bin/sh
         - -c
diff --git a/pkg/yurtctl/util/kubernetes/util.go b/pkg/yurtctl/util/kubernetes/util.go
index f4e8cc88ef7..5276b364b2e 100644
--- a/pkg/yurtctl/util/kubernetes/util.go
+++ b/pkg/yurtctl/util/kubernetes/util.go
@@ -37,7 +37,7 @@ var (
 	CheckServantJobPeriod = time.Second * 10
 	// ValidServerVersion contains all compatable server version
 	// yurtctl only support Kubernetes 1.12 - 1.14 for now
-	ValidServerVersions = []string{"1.12", "1.13", "1.14"}
+	ValidServerVersions = []string{"1.12", "1.12+", "1.13", "1.13+", "1.14", "1.14+"}
 )
 
 // YamlToObject deserializes object in yaml format to a runtime.Object