minikube start -v 10 --extra-config=apiserver.Authorization.Mode=RBAC
...
Setting up kubeconfig...
Starting cluster components...
^C

$ minikube ssh
$ docker logs 9f3405f5237a
Error: unknown flag: --Authorization.Mode
Usage:
  kube-apiserver [flags]

...

$ minikube version
minikube version: v0.26.1

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.6", GitCommit:"6260bb08c46c31eea6cb538b34a9ceb3e406689c", GitTreeState:"clean", BuildDate:"2017-12-21T06:34:11Z", GoVersion:"go1.8.3", 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"}