I was having the exact same issue, after some digging around, found that the cloudDriver was throwing bunch of error for access denied while accessing the kubernetes API's.

To see running pods: kubectl get pods

To see logs of the cloudDriver pods - kubectl logs YOUR_CLOUD_DRIVER_POD_NAME

I was reading online and found that spinnaker needs RBAC access control setup. Then lead me to this answer, which solved it for me temporarily until I get my self familiar with spinnaker.

Below command as suggested in above link, helped me and I was able to run spinnaker in minikube in my local machine.

kubectl create clusterrolebinding spinnaker-default-crbinding --clusterrole cluster-admin --serviceaccount=default:default

Just to note that you will need to change --serviceaccount accordingly. I had to change it.