NEVER log in as root - always sudo when you need root privileges.
On most of the linux distribustions these days you cant login as root.
You can login as root on any distribution, it's just a matter of how much effort they put into stopping you from logging on as root.
sudo passwd root
You cannot login from the login screen until you do that command regardless. Ubuntu locks the root account by default.
Ok, this is what i get when i try login as rootKinda annoys me but i get over it. I'll try get an image of the startx thing.