I face huge problem to install WSL & install kubectl into WSL. Using this following steps I have install both the component successfully in my system. Please find the following.

Step 1:- Enable Windows subsystem for linux :- check this reference it will guide you to install WSL properly in your system.

https://www.windowscentral.com/install-windows-subsystem-linux-windows-10

Step 2:- Install kubectl into WSL. find the following reference link it will help you (https://rancher.com/learning-paths/how-to-manage-kubernetes-with-kubectl/)

I use the following command step by step. For my case kubectl already install in my windows PowerShell

• curl -LO https://dl.k8s.io/release/v1.21.0/bin/linux/amd64/kubectl
• sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
• sudo apt-get update

Now your kubectl get install in your ubuntu terminal. we can execute the following command to test kubectl.

az account set --subscription <subscription ID>
az aks get-credentials --resource-group <RG name> --name <Cluster name>

Test your kubectl configuration to execute following command

kubectl config get-contexts

if it's not showing your cluster details or it's showing following error

The connection to the server localhost:8080 was refused - did you specify the right host or port

Don't worry.. I did a trick, I locate my c:\Users\<username>\.kube\config file and copy it into my WSL cp config ~/.kube/

After that it's start working.