Hi,
Seems your repo is out of date now, please update how to install today, thanks!
[root@kube-1 hdfs]$ helm repo add incubator https://kubernetes-charts-incubator.storage.googleapis.com
Error: repo "https://kubernetes-charts-incubator.storage.googleapis.com" is no longer available; try "https://charts.helm.sh/incubator" instead
Cheers,
Dan