no matches for kind "Deployment" in version "extensions/v1beta1"

In Kubernetes 1.16 some apis have been changed.

You can check which apis support current Kubernetes object using

$ kubectl api-resources | grep deployment
deployments                       deploy       apps                           true         Deployment

This means that only apiVersion with apps is correct for Deployments (extensions is not supporting Deployment). The same situation with StatefulSet.

You need to change Deployment and StatefulSet apiVersion to apiVersion: apps/v1.

If this does not help, please add your YAML to the question.

EDIT As issue is caused by HELM templates included old apiVersions in Deployments which are not supported in version 1.16, there are 2 possible solutions:

1. git clone whole repo and replace apiVersion to apps/v1 in all templates/deployment.yaml using script
2. Use older version of Kubernetes (1.15) when validator accept extensions as apiVersion for Deployment and StatefulSet.

to convert an older Deployment to apps/v1, you can run:

kubectl convert -f ./my-deployment.yaml --output-version apps/v1

You can change manually as an alternative. Fetch the helm chart:

helm fetch --untar stable/metabase

Access the chart folder:

cd ./metabase

Change API version:

sed -i 's|extensions/v1beta1|apps/v1|g' ./templates/deployment.yaml

Add spec.selector.matchLabels:

spec:
[...]
selector:
    matchLabels:
    app: {{ template "metabase.name" . }}
[...]

Finally install your altered chart:

helm install ./ \
  -n metabase \
  --namespace metabase \
  --set ingress.enabled=true \
  --set ingress.hosts={metabase.$(minikube ip).nip.io}

Enjoy!