Things to install on Ubuntu 20.04 Focal Fossa

Things to install on Ubuntu 20.04

This article explores various software that you can install on Ubuntu 20.04 Focal Fossa. There is a variety of things that can be installed on Ubuntu 20.04, hence we have divided all the software into two categories: Ubuntu user and DevOps.

We not only provide you with ideas of what can be installed but also link to tutorials that take you through the installation process.

In this guide you will discover:

  • What software you can install on Ubuntu 20.04 as an every day Ubuntu user
  • What software to install on Ubuntu 20.04 for DevOps

This article will be continuously updated with more things to install on Ubuntu 20.04 so keep checking for updates.

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Extend LEDE/OpenWRT system storage with USB

How to Extend LEDE/OpenWRT System Storage with an USB Device

LEDE/OpenWRT is a Linux-based operating system which can be used as an alternative to proprietary firmwares on a wide range of routers.

Installing it provides increased security, let us tweak our router and give us a wide range of software packages to install from the system repositories.

Installing packages is
very easy, thanks to the opkg package manager, but often the available
space on common routers is quite limited. In this tutorial we will see how to
extend the available system space using an USB device.

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How to Create Backups with Fsarchiver on Linux

How to Create Backups with Fsarchiver on Linux

Fsarchiver is a free software utility that let us create file-level backups of one or multiple filesystems in a single archive. One big advantage of this kind of backup is that we can restore it on a filesystem smaller than the original one (but of course large enough to contain all the files); this is usually impossible when performing block-level backups, using tools like partclone or dd. In this article we will learn how to install and use the application and its main features.

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Install Ubuntu from USB - 20.04 Focal Fossa

Ubuntu 20.04 installation from USB

This article provides you with a detailed description of installing Ubuntu 20.04 Focal Fossa from USB after such bootable USB (also referred to as live USB) had been created.

In this tutorial you will learn:

  • How to download Ubuntu 20.04
  • How to create Bootable USB or DVD
  • How to access Boot Menu and BIOS/UEFI
  • How to boot Ubuntu 20.04 from USB
  • How to try Ubuntu 20.04 before installing
  • How to install Ubuntu 20.04 from USB

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How to verify downloaded Ubuntu ISO image checksum

How to verify downloaded Ubuntu ISO image checksum

In this tutorial you will learn how to verify the authenticity of downloaded Ubuntu ISO image. The aim is to ensure that the Ubuntu downloaded ISO has not been tempered with, it is not corrupted in someway and is malware free.

In this tutorial you will learn:

  • How to obtain the correct signature key
  • How to import the correct signature key
  • How to verify the content of the checksum file
  • How to verify downloaded Ubuntu ISO image checksum

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How to install Fedora/RHEL/CentOS via kickstart on an existing LUKS device

How to install Fedora/RHEL/CentOS via kickstart on an existing LUKS device

Kickstart installations let us easily script and replicate unattended or semi-unattended installations of Fedora, Red Hat Enterprise Linux or CentOS. The instructions needed to install the operating system are specified, with a dedicated syntax, inside a Kickstart file which is passed to the Anaconda installer. In this tutorial we will see how to reuse an already existing LUKS (Linux Unified Keys Setup) container when performing a Kickstart installation: this is something that cannot be achieved just with Kickstart instructions and requires some extra steps.

In this tutorial you will learn:

  • How to use an existing LUKS container when performing a Kickstart installation of Fedora, RHEL or CentOS
  • How to create and use an updates.img file to be used with the Anaconda installer.

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Adding swap space to the system

Add new partitions, logical volumes, and swap to a system non-destructively – RHCSA Objective Preparation

Disk and space management is an essential knowledge of a sysadmin. It is his or her everyday job to handle disk issues. As part of the RHCSA exam preparation, we will learn how to add new space of various types to the system, using the tools provided by RHEL8. We already covered many of these tasks, and in this tutorial we will focus on adding new space without harming the data contained in the system.

In this tutorial you will learn:

  • How to add new partitions to RHEL8
  • How to add new logical volumes to RHEL8
  • How to add swap to RHEL8

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How to Kill a Running Process on Linux

How to Kill a Running Process on Linux

Everything that’s running on a Linux system – a service, script, or anything else – is considered a “process.” If you need to end a running process on Linux, the kill command is sure to do the job.

In this guide for Linux administrators, we’ll go over the kill Linux command and how to use its various options to end, or “kill,” a running process on Linux.

In this tutorial you will learn:

  • How does the kill command work?
  • How to see what processes are running
  • How to kill a process by PID
  • How to kill a process that refuses to close
  • How to kill a process by name

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How to Monitor RAM Usage on Linux

How to Monitor RAM Usage on Linux

The RAM usage on a system is good to know for a few reasons. Firstly, it can give you some insight into whether or not it’s necessary to upgrade the amount of memory inside your server or computer. If you see the memory utilization regularly nearing full capacity, it could indicate that your system needs an upgrade.

On the other hand, it can also help you track down problems on a system. A spike in memory usage can indicate an issue with a process running on the computer. In this tutorial for Linux administrators, we’ll go over a few methods to check and monitor the RAM usage on Linux.

In this tutorial you will learn:

  • How to check RAM usage with free
  • Monitoring ongoing RAM usage with free
  • How does free work?
  • How to check RAM usage with top
  • How to check RAM usage with htop

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How to Check and Monitor CPU utilization on Linux

How to Check and Monitor CPU utilization on Linux

As a Linux administrator, it’s important to keep an eye on how your server (or servers) is performing. One way to measure its performance is to track the CPU usage. This will give you insight into the performance of the system as well as show how the hardware resources are being divided up across the various running services.

In this guide, we’ll go over a few methods to check and monitor the CPU utilization on a Linux system. Whether you are in charge of a server or just your personal desktop, the computer’s CPU usage is useful information that’s easy to acquire.

In this tutorial you will learn:

  • How to check CPU usage with top
  • Understanding the output from top and htop
  • Monitor CPU usage with systat package
  • How to configure CPU monitoring alters

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Apt proxy configuration on Ubuntu 20.04 Focal Fossa Linux

Apt proxy configuration on Ubuntu 20.04 Focal Fossa Linux

You are reading a quick tutorial on how to configure apt proxy server and client on Ubuntu 20.04 Focal Fossa Linux

In this tutorial you will learn:

  • How to install and configure apt proxy server
  • How to start apt proxy server
  • How to open firewall port for apt proxy incoming traffic
  • How to configure apt proxy client

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