helm: can't connect to 127.0.0.1:8080

I can’t get helm to work on a new minikube install

minikube start --cpus 4 --memory 12288 --vm-driver kvm2
minikube addons enable heapser
minikube addons enable ingress
minikube addons enable freshpod
minikube addons enable registry-creds
helm init

$ helm install --name oc --set server.service.type=NodePort --set rbac.create=false stable/prometheus
Error: Get http://localhost:8080/version: dial tcp 127.0.0.1:8080: connect: connection refused

$ helm list
Error: Get http://localhost:8080/api/v1/namespaces/kube-system/configmaps?labelSelector=OWNER%!D(MISSING)TILLER: dial tcp 127.0.0.1:8080: connect: connection refused

$ helm reset
Error: Get http://localhost:8080/api/v1/namespaces/kube-system/configmaps?labelSelector=OWNER%!D(MISSING)TILLER: dial tcp 127.0.0.1:8080: connect: connection refused

Output of helm version:

Client: &version.Version{SemVer:"v2.9.0", GitCommit:"f6025bb9ee7daf9fee0026541c90a6f557a3e0bc", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.9.0", GitCommit:"f6025bb9ee7daf9fee0026541c90a6f557a3e0bc", GitTreeState:"clean"}

Output of kubectl version:

Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.1", GitCommit:"d4ab47518836c750f9949b9e0d387f20fb92260b", GitTreeState:"clean", BuildDate:"2018-04-12T14:26:04Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.0", GitCommit:"fc32d2f3698e36b93322a3465f63a14e9f0eaead", GitTreeState:"clean", BuildDate:"2018-03-26T16:44:10Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

Cloud Provider/Platform (AKS, GKE, Minikube etc.):

minikube: 0.26.1