I've manually tried to verify the dashboard is available following the steps described with the kubernetes-calico bundle. As seen below a connection to the calico cidr IP assigned to the kubernetes-dashboard-7cf54d76b5-r8k8g pod times out.

ubuntu@anorith:~$ kubectl proxy
Starting to serve on 127.0.0.1:8001
^Z
[1]+  Stopped                 kubectl proxy
ubuntu@anorith:~$ bg
[1]+ kubectl proxy &

ubuntu@anorith:~$ nc -nz 127.0.0.1 8001
ubuntu@anorith:~$ echo $?
0

ubuntu@anorith:~$ curl 'http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/#!/login'
Error trying to reach service: 'dial tcp 172.16.1.199:8443: i/o timeout'

ubuntu@anorith:~$ kubectl describe po -n kubernetes-dashboard
Name:         dashboard-metrics-scraper-cc4c766b4-5st8p
Namespace:    kubernetes-dashboard
Priority:     0
Node:         juju-cd5864-kubernetes-9/172.16.0.185
Start Time:   Wed, 19 Feb 2020 20:46:50 +0000
Labels:       k8s-app=dashboard-metrics-scraper
              pod-template-hash=cc4c766b4
Annotations:  <none>
Status:       Running
IP:           172.16.1.201
IPs:
  IP:           172.16.1.201
Controlled By:  ReplicaSet/dashboard-metrics-scraper-cc4c766b4
Containers:
  dashboard-metrics-scraper:
    Container ID:   containerd://810e53b4beb6dc605bd9f52f3fb2e8281515db7cea1fb1400565cd8aecd44e7e
    Image:          rocks.canonical.com:443/cdk/kubernetesui/metrics-scraper:v1.0.1
    Image ID:       rocks.canonical.com:443/cdk/kubernetesui/metrics-scraper@sha256:3b1cb436dbc2c02aabd7d29e3d9b3f8b4dfc1eb50dbcc63640213ef1139235dd
    Port:           8000/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Wed, 19 Feb 2020 20:48:31 +0000
    Ready:          True
    Restart Count:  0
    Liveness:       http-get http://:8000/ delay=30s timeout=30s period=10s #success=1 #failure=3
    Environment:    <none>
    Mounts:
      /tmp from tmp-volume (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from kubernetes-dashboard-token-qjphl (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  tmp-volume:
    Type:       EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium:     
    SizeLimit:  <unset>
  kubernetes-dashboard-token-qjphl:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  kubernetes-dashboard-token-qjphl
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node-role.kubernetes.io/master:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>


Name:         kubernetes-dashboard-7cf54d76b5-r8k8g
Namespace:    kubernetes-dashboard
Priority:     0
Node:         juju-cd5864-kubernetes-9/172.16.0.185
Start Time:   Wed, 19 Feb 2020 20:46:50 +0000
Labels:       k8s-app=kubernetes-dashboard
              pod-template-hash=7cf54d76b5
Annotations:  <none>
Status:       Running
IP:           172.16.1.199
IPs:
  IP:           172.16.1.199
Controlled By:  ReplicaSet/kubernetes-dashboard-7cf54d76b5
Containers:
  kubernetes-dashboard:
    Container ID:  containerd://86d925a8abeb96fc4e0164ee91d9275d800a38d1e746510861a3ce517c4c6c08
    Image:         rocks.canonical.com:443/cdk/kubernetesui/dashboard-amd64:v2.0.0-beta4
    Image ID:      rocks.canonical.com:443/cdk/kubernetesui/dashboard-amd64@sha256:1dc220ba89df386cf8696d53093fc324a12f918b82aefb8deca3974b0b179d04
    Port:          8443/TCP
    Host Port:     0/TCP
    Args:
      --auto-generate-certificates
      --authentication-mode=basic
      --namespace=kubernetes-dashboard
    State:          Running
      Started:      Wed, 19 Feb 2020 20:48:10 +0000
    Ready:          True
    Restart Count:  0
    Liveness:       http-get https://:8443/ delay=30s timeout=30s period=10s #success=1 #failure=3
    Environment:    <none>
    Mounts:
      /certs from kubernetes-dashboard-certs (rw)
      /tmp from tmp-volume (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from kubernetes-dashboard-token-qjphl (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  kubernetes-dashboard-certs:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  kubernetes-dashboard-certs
    Optional:    false
  tmp-volume:
    Type:       EmptyDir (a temporary directory that shares a pod's lifetime)
    Medium:     
    SizeLimit:  <unset>
  kubernetes-dashboard-token-qjphl:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  kubernetes-dashboard-token-qjphl
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node-role.kubernetes.io/master:NoSchedule
                 node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>