title: how to disable numa on ubuntu 20.04
body: <p>I want to disable NUMA on Ubuntu 20.04, but I can't find anyway on Ubuntu website?
  dose anyone know how to do it?</p>
  <p>The RedHat/CentOS supports a way:
  add numa=off to /etc/default/grub,
  and use grub2-mkconfig generate a new boot config file /etc/grub2.cfg.</p>
  <p>But there is no /etc/grub2.cfg on ubuntu.</p>