Vector Linux is an excellent Linux distro for lazarus development and it is relatively easy to set it up.
All you need are three files, 2 from freepascal and one from lazarus.
First, download FPC as 1 big file, fpc-2.6.0.i386-linux.tar
Then download FPCBuild fpcbuild-2.6.0.tar.gz
Finally, download the Lazarus source lazarus-1.0.2-0.tar.gz
Extract the FPC 1 big build and open a terminal in that directory, su for root access and run ./install.sh. You will be asked where you want the files to be placed, and it will be installed.
Extract the Lazarus source into a folder, I always setup 'lazarus' in my home folder. Open a terminal in this folder, (don't bother with root access, it makes it easier for installing extra components later), and issue the command 'make clean all'. Lazarus will compile. I always place a launch link on the desktop for easy access after this.
Extract the FPCBuild into a folder and copy the fpcsrc folder into your lazarus folder.
Start Lazarus. You will be asked where the source folder is. Point towards this and Lazarus will start up and voila, a working IDE.
I use this method on both of my desktops and my laptop, (Vector Linux 7 GOLD, Vector Linux 7 Light and Slackware 14 64bit), it has never failed me yet.