GNU/Linux Lubuntu 20.04 Installing Lazarus – Quick-Start Guide
You are Welcome! The Tutorial Shows You Step-by-Step How to Install Lazarus IDE Release for Lubuntu 20.04 Focal LTS GNU/Linux Desktop.
And Lazarus IDE for Object-Pascal/Delphi is a Free Cross-Platform visual Integrated Development Environment (IDE) for Rapid Application Development (RAD) using the Free Pascal Compiler, which supports Dialects of Object Pascal, to varying Degrees.
Furthermore, the Software Developers use Lazarus to Create Native-Code Console and Graphical User interface (GUI) Apps for the Desktop, and also for Mobile Devices, Web Apps, Web Services, Visual Components and Function Libraries (.so, .dll, etc., for use by other programs).
Finally, the guide includes detailed instruction on How to Getting-Started with Free Pascal Development on Lazarus for Lubuntu.

1. Terminal Getting-Started Guide
How-to Quick-Start with Command Line on Lubuntu GNU/Linux
First, Update the Apt Repo Sources with:
sudo apt update
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo.
Contents
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