https://kubernetes.github.io/dashboard/" is not a valid chart repository or cannot be reached:

Unable to access the helm repo as it is not available which was provided in the documentation.

`Error: looks like "https://kubernetes.github.io/dashboard/" is not a valid chart repository or cannot be reached: failed to fetch https://kubernetes.github.io/dashboard/index.yaml : 404 Not Found`

Search the Kubernetes website documentation for the referenced URL and inspect the Helm repository instructions around it. Verify the documented repository address with Helm, update the documentation reference, and confirm that adding the repository no longer returns the reported 404 error.

Written by the indexing model from the issue text.