Originally Posted by geekmaster
A complication was that I had to reset a boot counter manually. The file /var/local/upstart/lab126_gui.restarts had the value "2" in it. I did "echo 0 > /var/local/upstart/lab126_gui.restarts" to reset the boot counter. [Thanks for the suggestion, nueva!]
Thank you, this helped me when I got stuck at the start screen.