In essence there shouldn't be a difference between installing Ubuntu or Xubuntu. But if you encountered that hurdle, here's how you can get xfce on 'ubuntu': in

In essence there shouldn't be a difference between installing Ubuntu or Xubuntu. But if you encountered that hurdle, here's how you can get xfce on 'ubuntu': install the "xubuntu-desktop" package from apt and it'll be available as an option on your session chooser at the login screen. this is a virtual package which installs the whole xfce desktop environment. it is essentially what xubuntu does :)