Author: Rahul

I, Rahul Kumar am the founder and chief editor of TecAdmin.net. I am a Red Hat Certified Engineer (RHCE) and working as an IT professional since 2009..

A firewall is a security application that prevents unauthorized users and secures your system. By default, the Firewall is installed on Windows systems. It is highly recommended to keep the Windows firewall active. You can allow access to any port or service with a firewall configuration. The latest Windows 8 and 8.1 systems have Windows Firewall and the Windows 10 and above systems use Windows Defender Firewall. This tutorial is created on Windows 8.1, so the screenshots may differ for Windows 10 and above users. Enable or Disable the Windows Firewall Use the below steps to enable or disable a…

Read More

Java is the most popular object-oriented, robust, platform-independent programming language. A large number of applications developed on Java required a system has Java installed. OpenJDK is an open-source implementation of Java available freely for production use. This guide will help you to install Java (OpenJDK 17, 11, and 8) LTS releases. Also, help you to install Oracle Java 17 LTS) on your Ubuntu system. You will also find the instruction’s to switch between multiple installed Java versions. Installing Java on Ubuntu Java 17 is the latest LTS release available for installation. JDK packages provide the full Java development libraries, helpful…

Read More

Once the Linux desktop system is started, you see a login window. This is displayed by the Display manager. A display manager is an independent application from the desktop manager. You can install and use any display manager on your system. This tutorial will help you to install multiple display managers on the Ubuntu desktop. Also provides you instructions to switch between display managers. What is Display Manager? A Display Manager is a graphical login program and session manager that is responsible for user authentication. It is a totally separate application from the desktop environment. Display Manager is also known…

Read More

The latest Ubuntu systems use GNOME as a default theme. GDM3 is the default display manager which is responsible for loading the login screen. We need to tweak settings in gdm3 to change the background of the login screen. This tutorial will help you to change the default login screen background on Ubuntu systems. Install Required Tools First of all, install a required library on your system. sudo apt install libglib2.0-dev-bin Now download the script that will help you with setting up the login screen background wallpaper on Ubuntu systems. wget -qO – https://github.com/PRATAP-KUMAR/ubuntu-gdm-set-background/archive/main.tar.gz | tar zx –strip-components=1 ubuntu-gdm-set-background-main/ubuntu-gdm-set-background To…

Read More
PHP

PHP is a programming language used for developing web applications. You must install PHP packages on a Ubuntu system to run the application written on it. Generally, it is used to create e-commerce websites, blogs, and API applications. We will use the Ondrej PPA for installing PHP on Ubuntu 22.04 LTS system. Which contains PHP 8.1, 8.0, 7.4, 7.3, 7.2. 7.1, 7.0 & PHP 5.6 packages. You can install any of them version as required for your application. The new application developers are suggested to use latest PHP version ie PHP 8.1. In this tutorial, you will learn how to…

Read More

The Problem: While upgrading the Ubuntu OS version, I faced the following issue with the do-release-upgrade command. Even all the current packages were upgraded with apt upgrade. sudo do-release-upgrade We faced a known issue that would not allow us to continue with the upgrade. You will see the following error message: Checking for a new Ubuntu release Please install all available updates for your release before upgrading. Here are 2 solutions available to resolve this issue. It may be one solution not worked in some situations, try another solution. Solution 1: The first solution is to disable all third-party repositories…

Read More

LightDM is a free, opensource and lightweight X Display Manager for Linux Desktop systems. It is also used as a cross-desktop display manager. It supports various Desktop environments including various display technology, such as Wayland, Mir, and X windowing systems. This tutorial will help you to install the LightDM display manager on the Ubuntu Desktop system. Installing Lightdm on Ubuntu LightDM packages are available under default apt repositories. You can install lightdm on Ubuntu by running the following commands. sudo apt update sudo apt install lightdm Configure Lightdm as Default Display Manager Once the lightdm is installed on your system.…

Read More

The Problem: Today, I launched a new AWS instance with Ubuntu 22.04. The default key provided by AWS is working fine with SSH. But when I attached my personal ssh key to the server and tried to access with FileZilla over SFTP, I got the following error in auth.log. May 10 11:52:58 localhost sshd[57650]: Disconnected from authenticating user ubuntu 203.190.146.202 port 46565 [preauth] May 10 11:52:59 localhost sshd[57652]: userauth_pubkey: key type ssh-rsa not in PubkeyAcceptedAlgorithms [preauth] May 10 11:53:00 localhost sshd[57652]: message repeated 3 times: [ userauth_pubkey: key type ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]] May 10 11:53:00 localhost sshd[57652]: error:…

Read More

Recently I created a Ubuntu desktop virtual machine in the Hyper-V platform. After login to the desktop realises that the screen resolution is not correct. I tried to change VM to full-screen mode but it opens in partial screen. When I checked the resolution under the settings found below: This how-to guide will help you to change the screen resolution of an Ubuntu VM in Hiper-V. This also allows you to run Ubuntu VM in full-screen mode in Hiper-V. Changing Screen Resolution in Hyper-V Ubuntu VM Follow the instructions to change the screen resolution of an Ubuntu VM in Hyper-V:…

Read More

Question – How to find static IP Address of My Ubuntu Desktop system? 2 Ways to find IP Address on Ubuntu 22.04 Desktop and server editions? Ubuntu 22.04 desktop edition comes with an attractive Gnome Desktop Environment. You can either use the command prompt to check the current IP address on your system or use a GUI option to view the local IP address on your system. You can also use another article to change IP address on Ubuntu 22.04 desktop and server editions. Choose one of the below methods to check the current IP address on a Ubuntu system.…

Read More