I have installed Kristoff twice and had the same issue. After the installation process my computer reboots and I am at the login screen, with backslash in the username box. If I input the username and pa** I created during the setup process then my computer freezes indefinitely. I leave backslash in and leave the pa**word box blank I get an invalid pa**word error. I've tried root as the pa**word and get the same thing. Can anyone help me with this?