I had some issues with the installation of the desktop version of Ubuntu gnome (my graphic-card is not supported by default I had to install the right drive for it, before I get a shell thats not totally broken, even with the server install I had to input the driver installation command blind), so I decided to install Ubuntu server and then install
Thats the state know. Everything is "fine", but there a two things I don't understand:
after installing the desktop I had to run
startxto get the visual desktop, after a reboot I got the login-screen by default.
When I switch the tty with SUPER+ALT [F1,F2,...] there is my gnome-desktop running on tty2 and a login screen on tty1. When I try to log in on tty1 I end up on tty2 and on tty1 appease the login-screen again.