Install on Ubuntu 11.10

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In General

Overview

To install Lazarus you install three things:

  • fpc - the Free Pascal compiler
  • fpc-src - the source code for Free Pascal
  • Lazarus -the IDE for Free Pascal

Versions

You must install the correct version of Free Pascal for the version of Lazarus you choose. The versions below are correct.

Ubuntu 11.10 (Oneiric Ocelot)

Matching versions of Lazarus and Free Pascal are in the repository (20/02/12). They are

  • Lazarus 0.9.30-2.
  • Free Pascal 2.4.4

In Synaptic it is called Lazarus 0.9.30-2Build1.

Find and install the packages

In the Software Centre search for

  • IDE for FreePascal (SDK metapackage)
  • Free Pascal Compiler fpc
  • Free Pascal source code

With Synaptic, install everything beginning with Laz, fpc or fp.

Problem 1

Once you have installed Lazarus, it will not work. Even if you add no code at all and compile and run a 'blank form' project (having first saved it) you will get this error message:

Solution (10 mins): Remove the Ubuntu taskbar menu and scrollbars

  • Remove the taskbar

Open a terminal and try 

sudo

Give your password These can be re-installed if needed with

  • Remove the Ubuntu overlay scrollbars

Open synaptioc Search for Uninstall the packages

These can be re-installed if needed with

The 'blank form' project should now run with no errors.

Problem 2

If you add a button to your 'blank form' project. In the Events tab of the Object Inspector , try to open the 'Click' event handler. You will get the error message 

Can't find class Classes

or 

Can't find class Sysutils

Solution (10 mins): Reconfigure Lazarus as sudo

This can only be solved if you open Lazarus as sudo.

  • Scan the Pascal source code

Open a terminal and start Lazarus as sudo with 

gksudo StartLazarus

Give your sudo password

In Lazarus choose Environment/Rescan FPC source directory

  • Rebuild Lazarus.

Open a terminal 

gksudo StartLazarus

Give your sudo password

In Lazarus choose Tools/BuildLazarus with profile:Build all

Ubuntu 10.04 LTS (Lucid Lynx)

At present there is a bug 20915 which makes it impossible to use the version of Lazarus in the Ubuntu repository. Bug Report

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