Install DEB file on Ubuntu 20.04

Install DEB file on Ubuntu 20.04 Focal Fossa Linux

A file that has the .DEB file extension is a Debian software package file. They contain software to be installed on Debian or a Debian-based operating system. Ubuntu falls into that category, being based on Debian and capable of executing .DEB files.

In this article, we’ll go over the steps to install a DEB file on Ubuntu 20.04 Focal Fossa and talk about some best practices along the way.

In this tutorial you will learn:

  • DEB file security and searching Ubuntu’s package repository
  • How to intall DEB files with dpkg
  • How to install DEB files with gdebi
  • How to install DEB files via GUI
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Listing PPA repositories on Ubuntu 20.04

How to list and remove PPA repository on Ubuntu 20.04 Linux

As you probably know, tons of software can be installed in Ubuntu 20.04 right from the command line via apt or from the Ubuntu Software application on Ubuntu’s desktop. The way this works is that Ubuntu will query a repository which contains links to the various software you may wish to install. It searches for the package you specify, and then downloads and installs it.

Although Ubuntu’s default package archive contains some of the most common software people need, a lot of times it’s necessary to install a package using a PPA repository. No problem there, except these PPA repositories don’t remove themselves unless you do it manually. After a while, your system could be querying a lot of irrelevant PPA repositories every time you install or update software. In this guide, we’ll show you how to list and delete the PPA repositories on Ubuntu 20.04 Focal Fossa.

In this tutorial you will learn:

  • How to list PPA repositories via command line
  • How to remove PPA repositories via command line
  • How to list and remove PPA repositories via GUI

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How to install GCC the C compiler on Ubuntu 20.04 LTS Focal Fossa Linux

GCC, the GNU Compiler Collection is a compiler system developed to support various programming languages. It is a standard compiler used in most projects related to GNU and Linux, for example, Linux kernel. The objective of this tutorial is to install GCC the C compiler on Ubuntu 20.04 LTS Focal Fossa Linux. This will be achieved by using the apt install command.

In this tutorial you will learn:

  • How to install GCC compiler
  • How to Check C compiler version
  • How to Compile basic C program from source code
  • How to run C program

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How to switch between multiple GCC and G++ compiler versions on Ubuntu 20.04 LTS Focal Fossa

In this tutorial we will install multiple versions of GCC and G++ compilers using the apt install command. Furthermore, by use of the update-alternatives tool you will learn how to easily switch between multiple GCC and G++ compiler versions and how to check the currently selected compiler version.

In this tutorial you will learn:

  • How to install multiple GCC and G++ compiler versions
  • How to create alternative compiler version list
  • How to switch between multiple compiler versions

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How to install G++ the C++ compiler on Ubuntu 20.04 LTS Focal Fossa Linux

G++, the GNU C++ Compiler is a compiler in Linux which was developed to compile C++ programs. The file extensions that can be compiled with G++ are .c and .cpp. The aim of this tutorial is to install G++ the C++ compiler on Ubuntu 20.04 LTS Focal Fossa Linux. This will be achieved by installing the build-essential package.

In this tutorial you will learn:

  • How to install G++ compiler on Ubuntu 20.04
  • How to Check C++ compiler version
  • How to Compile basic C++ program from source code
  • How to run G++ to compile C++ program

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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 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 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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