Lazarus Elementary OS Installation Guide
Hi! The Tutorial shows you Step-by-Step How to Install Lazarus IDE in Elementary OS 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.
Moreover, 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 Elementary OS.

Open a Terminal Shell emulator window
(Press “Enter” to Execute Commands)
Search into Apps.Add Lazarus Elementary OS PPA Repository
Here Lazarus PPA Repo InstallHow to Install Lazarus and Free Pascal PPA Repository for Elementary OS GNU/Linux Based SystemsThen to Install Lazarus on Elementary OS.
Copysudo apt install lazarus fpc
With this command you get installed both: Lazarus and the Free Pascal Compiler.
Lazarus Free Pascal Getting-Started Guide
Here Free Pascal Quick Start GuideHow to Quick Start in Free Pascal Delphi on Lazarus for Elementary OS