I have installed minikube in ubuntu VM in oracle virtualbox. I ran $minikube start command. But it is showing error as: "Unable to pick default driver. No possible driver was detected."
While starting a minikube cluster you have to specify a vm driver that will be used to run Kubernetes in. You can do it by using minikube start --driver virtualbox.
You can set up default driver by using minikube config set driver virtualbox.