How to disable/enable SELinux on Ubuntu 20.04 Focal Fossa Linux - LinuxConfig.org

The objective of this article is to install, enable and disable SELinux on Ubuntu 20.04 Focal Fossa Linux.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-disable-enable-selinux-on-ubuntu-20-04-focal-fossa-linux