I’m using whonix 14 on vbox. Without any changes to the system two of my WS (regularly updated) started booting in tty1 rather than my graphical desktop.
I’ve managed to log in the tty1 and got to a terminal.
Another clone, that hasn’t been update in a while is fine and loads kde graphical.
startkde in the terminal returns ‘‘DISPLAY is not set or cannot connect to the X server’’