Problem scenario
You are trying to run a kubeadm command. But you get this error:
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
[ERROR Port-10250]: Port 10250 is in use
[preflight] If you know what you are doing, you can make a check non-fatal with--ignore-preflight-errors=...
What should you do?
Solution
Remove the kubelet that snap installed; this assumes that you have two installations of kubelet. Here is the command:
sudo snap remove kubelet