Depending on your Ubuntu 20.04 Server/Desktop installation your system might not come with the ping command pre-installed. This is especially the case for docker containers. Any attempt to ping a remote system will result in the following error:
ping linuxconfig.org bash: ping: command not found
In this tutorial you will learn:
ping command on Ubuntu 
The objective of this tutorial is to learn how to identify internal and external IP address on Ubuntu 20.04 Focal Fossa Linux.
In this tutorial you will learn:
The objective of this tutorial is to provide the reader with a troubleshooting guidance on how to resolve the error message Unable to locate package on Ubuntu 20.04 Focal Fossa Linux.
In this tutorial you will learn:
The objective of this tutorial is to set a root password on Ubuntu 20.04 Focal Fossa Linux.
In this tutorial you will learn:
The objective of this tutorial is to activate the UFW firewall on Ubuntu 20.04 Focal Fossa Linux.
In this tutorial you will learn:
In this tutorial you will learn how to permanently add a static route on Ubuntu 20.04 Focal Fossa Linux using netplan.
In this tutorial you will learn:
The objective is to install Ubuntu Studio as an alternative desktop environment to the Ubuntu 20.04 Focal Fossa Desktop/Server Linux.
In this tutorial you will learn:
tasksel 
In this tutorial you will learn how to set / change server’s Fully Qualified Domain Name (FQDN) on Ubuntu 20.04 Focal Fossa Linux server or desktop.
In this tutorial you will learn:
/etc/hosts
The objective of this tutorial is to hibernate ( suspend to disk ) the Ubuntu 20.04 Focal Fossa Linux Desktop.
In this tutorial you will learn:
The objective of this article is to provide the user with information on how to restart Apache 2 web-server on Ubuntu 20.04 Focal Fossa.
In this tutorial you will learn:
Even if Red Hat has developed podman and buildah, its own tools to work with containers, which come with some important advantages like a daemonless architecture, you may want to continue using the original Docker software on Fedora. In this tutorial we will explore the options we have on the latest release of the distribution to do so, and will see how to apply the needed fixes for Docker to work correctly.
In this tutorial you will learn:
The objective of this guide is to enable Automatic Login on Ubuntu 20.04 Focal Fossa Linux GNOME desktop with GDM display manager.
In this tutorial you will learn: