Bejelentkezési probléma sudo startx futtatása után

EN: After running sudo startx, system does not log in on Ubuntu Linux.

Problem: user root became owner of ~/.Xauthority file

Solution:
Press CTRL+ALT+F1, log in and run:
sudo chown USERNAME .Xauthority
sudo chgrp USERNAME .Xauthority

Where USERNAME is your user (login) name.