Gnome

From http ://ubuntuforums.org/showthread.php?t=207847, $ sudo aptitude install x-window-system-core gnome-core gdm firefox synaptic xubuntu-system-tools gnome-app-install

… even though the firewall is configured correctly… A: Ubuntu/Gnome sets TCP off by default in gdm.conf. So if its a new installation, or you’ve upgraded without saving the changes you made previously, edit gdm.conf…