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This allows to skip the helm install error:
helm -n kube-system install cern-magnum releases/cern-magnum --wait --version 0.11.0 --values /opt/magnum/install-cern-magnum-values.yaml
Error: cannot re-use a name that is still in use
Installation of the CERN helm chart occurs when cluster is created. https://gitlab.cern.ch/kubernetes/magnum/-/blob/cern/train/magnum/drivers/k8s_fedora_coreos_v1/templates/kubecluster.yaml#L1510
After a while if the job dosen't finish (due to heavy load on master node) the cern-metachart job will create a new install pod.
There is a chance that a new chart installation might be tried while there is a chart mid installation. So the release exists but is not complete.
helm install installations that might end up being successfull will fail subsequently, while
helm upgrade will 'upgrade' and pick up any leftover to-dos.