Unable to locate package error on Ubuntu 20.04 Focal Fossa Linux - LinuxConfig.org

The objective of this tutorial is to prove the reader with a troubleshooting guidance on how to resolve the error message Unable to locate package on Ubuntu 20.04 Focal Fossa Linux.
This is a companion discussion topic for the original entry at https://linuxconfig.org/unable-to-locate-package-error-on-ubuntu-20-04-focal-fossa-linux