If you want to try wlm-operator locally before updating your production cluster, use vagrant that will automatically install and configure all necessary software:
cd vagrant
vagrant up && vagrant ssh k8s-master
NOTE: vagrant up may take about 15 minutes to start as k8s cluster will be installed from scratch.
> $ vagrant ssh k8s-master
vagrant@k8s-master:~$ kubectl get no -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
k8s-master Ready master 20m v1.16.7 192.168.60.10 <none> Ubuntu 18.04.5 LTS 4.15.0-112-generic singularity://3.6.4
node-1 Ready <none> 3m34s v1.16.7 192.168.60.11 <none> Ubuntu 18.04.5 LTS 4.15.0-112-generic singularity://3.6.4