Comment 32 for bug 918401

A forums thread reports that some people got unity on upgrades from alpha-1 as well, which as far as I can tell is not the intention of the Lubuntu developers. I think the only solution to this for upgraders is to make a manual configuration change:

  echo 'APT::Install-Recommends "false";' | sudo tee /etc/apt/apt.conf.d/00InstallRecommends

I've reconfigured the Lubuntu alternate CDs to install this way by default, and I think you should respin Alpha 2 for that change or you'll have problems later. The desktop CDs will take a bit more work.