Install on Ubuntu
The easiest way to install lazarus and corresponding versions of FPC is by means of the Ubuntu Software Center that will install the lazararus/fpc version that is supported by the Ubuntu version.
apt-get install lazarus
On Ubuntu 15.10 Lazarus 1.4.0 / FPC 2.6.4 will be installed.
On Ubuntu FPC 3.0.4 will be installed in /usr/bin while Lazarus 2.0.6 will be installed in ~/.lazarus