I have installed Ubuntu 12.04 base system on my IBM Thinkpad labtop. Then I installed the gnome-shell using apt-get, but it does not work: I have the error message "cannot open X windows manager". I also tried to install Unity (also using apt-get) but it does not work, showing these : "unity-panel-service: no process found" and "compiz(core) - Fatal: Couldn't open display :0"
What would you advise in order to properly install a simple Ubuntu desktop (which one)?
Thanks for your concern