Which is the Desktop Environment of Zorin OS and is there any way to get it on Ubuntu?
Zorin OS use Gnome 3 Desktop Environment with customized themes. To install Gnome 3 use the following command:
sudo apt-get update && sudo apt-get install gnome-shell ubuntu-gnome-desktop
Then you need to get the themes from Zorin OS and apply to your Gnome installation. Since Zorin OS uses Ubuntu as base for it's packages it's simplier to install Zorin than to apply the themes to Ubuntu.
To install ZorinOS themes open Terminal (Press Ctrl+Alt+T) and type the following commands:
sudo add-apt-repository ppa:noobslab/themes sudo apt-get update sudo apt-get install zorinos-themes
To install ZorinOS icons open Terminal (Press Ctrl+Alt+T) type the following commands:
sudo add-apt-repository ppa:noobslab/icons2 sudo apt-get update sudo apt-get install zorinos-icons