I have downloaded and instaled lazarus with the fowllowing steps: Instaled fpc from…
The apt-get packages for FPC are old (1.0.6). Lazarus recommends using 1.0.7.
The classes not found error is because you haven't yet set the path to sources in your Environment Options for Lazarus yet. It's not replated to FPC. Go to Environment + Environment Options in Lazarus and make sure your paths are set. Most important is the FPC source directory. If your package didn't install the FPC sources (and I doubt it did) you'll need to download the FPC sources and then tell Lazarus where they are.
-Tony
