Pantheon on Lubuntu

Add repositories:

sudo add-apt-repository ppa:elementary-os/daily
sudo add-apt-repository ppa:elementary-os/os-patches
sudo add-apt-repository ppa:elementary-os/testing
sudo add-apt-repository ppa:philip.scott/elementary-tweaks

Install Desktop Interface Pantheon

sudo apt-get install elementary-theme elementary-icon-theme elementary-
default-settings elementary-desktop elementary-tweaks