microk8s: Pods stuck in ContainerCreating status, Failed create pod sandbox

When running “microk8s.enable dns dashboard”, the pods will stay in ContainerCreating status:

$ sudo snap install microk8s --beta --classic
microk8s (beta) v1.10.3 from 'canonical' installed

$ microk8s.kubectl get all 
NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.152.183.1   <none>        443/TCP   25s

$ microk8s.enable dns dashboard
Applying DNS manifest
service "kube-dns" created
serviceaccount "kube-dns" created
configmap "kube-dns" created
deployment.extensions "kube-dns" created
Restarting kubelet
Done
deployment.extensions "kubernetes-dashboard" created
service "kubernetes-dashboard" created
service "monitoring-grafana" created
replicationcontroller "monitoring-influxdb-grafana-v4" created
service "monitoring-influxdb" created

$ microk8s.kubectl get all --all-namespaces
NAMESPACE     NAME                                        READY     STATUS              RESTARTS   AGE
kube-system   pod/kube-dns-598d7bf7d4-f8lbm               0/3       ContainerCreating   0          9s
kube-system   pod/kubernetes-dashboard-545868474d-ltkg8   0/1       Pending             0          4s
kube-system   pod/monitoring-influxdb-grafana-v4-5qxm6    0/2       Pending             0          4s

NAMESPACE     NAME                                                   DESIRED   CURRENT   READY     AGE
kube-system   replicationcontroller/monitoring-influxdb-grafana-v4   1         1         0         4s

NAMESPACE     NAME                           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)             AGE
default       service/kubernetes             ClusterIP   10.152.183.1     <none>        443/TCP             1m
kube-system   service/kube-dns               ClusterIP   10.152.183.10    <none>        53/UDP,53/TCP       9s
kube-system   service/kubernetes-dashboard   ClusterIP   10.152.183.204   <none>        80/TCP              4s
kube-system   service/monitoring-grafana     ClusterIP   10.152.183.115   <none>        80/TCP              4s
kube-system   service/monitoring-influxdb    ClusterIP   10.152.183.228   <none>        8083/TCP,8086/TCP   4s

NAMESPACE     NAME                                   DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
kube-system   deployment.apps/kube-dns               1         1         1            0           9s
kube-system   deployment.apps/kubernetes-dashboard   1         1         1            0           4s

NAMESPACE     NAME                                              DESIRED   CURRENT   READY     AGE
kube-system   replicaset.apps/kube-dns-598d7bf7d4               1         1         0         9s
kube-system   replicaset.apps/kubernetes-dashboard-545868474d   1         1         0         4s

The pods will stay in status ContainerCreating.

$ microk8s.kubectl describe pod/kubernetes-dashboard-545868474d-ltkg8 --namespace kube-system
Name:           kubernetes-dashboard-545868474d-ltkg8
Namespace:      kube-system
Node:           <hostname>/192.168.1.17
Start Time:     Tue, 12 Jun 2018 14:33:39 -0400
Labels:         k8s-app=kubernetes-dashboard
                pod-template-hash=1014240308
Annotations:    scheduler.alpha.kubernetes.io/critical-pod=
Status:         Pending
IP:             
Controlled By:  ReplicaSet/kubernetes-dashboard-545868474d
Containers:
  kubernetes-dashboard:
    Container ID:   
    Image:          gcr.io/google_containers/kubernetes-dashboard-amd64:v1.6.0
    Image ID:       
    Port:           9090/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
    Restart Count:  0
    Limits:
      cpu:     100m
      memory:  50Mi
    Requests:
      cpu:        100m
      memory:     50Mi
    Liveness:     http-get http://:9090/ delay=30s timeout=30s period=10s #success=1 #failure=3
    Environment:  <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-vxq5n (ro)
Conditions:
  Type           Status
  Initialized    True 
  Ready          False 
  PodScheduled   True 
Volumes:
  default-token-vxq5n:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-vxq5n
    Optional:    false
QoS Class:       Guaranteed
Node-Selectors:  <none>
Tolerations:     CriticalAddonsOnly
Events:
  Type     Reason                  Age                From                     Message
  ----     ------                  ----               ----                     -------
  Normal   Scheduled               13m                default-scheduler        Successfully assigned kubernetes-dashboard-545868474d-ltkg8 to <hostname>
  Normal   SuccessfulMountVolume   13m                kubelet, <hostname>  MountVolume.SetUp succeeded for volume "default-token-vxq5n"
  Warning  FailedCreatePodSandBox  13m                kubelet, <hostname>  Failed create pod sandbox: rpc error: code = Unknown desc = NetworkPlugin kubenet failed to set up pod "kubernetes-dashboard-545868474d-ltkg8_kube-system" network: Error adding container to network: failed to Statfs "/proc/6763/ns/net": permission denied
  Normal   SandboxChanged          3m (x40 over 13m)  kubelet, <hostname>  Pod sandbox changed, it will be killed and re-created.