"The ClusterRoleBinding "kubernetes-dashboard" is invalid: roleRef: Invalid value" when deploying Web UI

The error "cannot change roleRef" was referring to the fact that the ClusterRoleBinding already existed.

Try deleting the existing ClusterRoleBinding kubernetes-dashboard

Run below to delete existing:

kubectl delete clusterrolebinding kubernetes-dashboard

After that try installing again. Let us know if that resolves the issue.