title: swapoff: /swapfile: swapoff failed: Cannot allocate memory
body: <p>I am getting below  error while running kubeadm init :</p>
  
  <pre><code>[init] Using Kubernetes version: v1.16.2
  [preflight] Running pre-flight checks
      [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
  error execution phase preflight: [preflight] Some fatal errors occurred:
      [ERROR Swap]: running with swap on is not supported. Please disable swap
  [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
  To see the stack trace of this error execute with --v=5 or higher
  </code></pre>
  
  <p><code>sudo swapoff -a
  swapoff: /swapfile: swapoff failed: Cannot allocate memory</code></p>
  
  <p>I am using Ubuntu VM in parallel desktop</p>
  
  <p><code>free -m command  output below:
  $ free -m
                total        used        free      shared  buff/cache   available
  Mem:            979         455          87           1         436         377
  Swap:          2047         695        1352</code></p>