How about starting a command line session with CTRL-ALT-F2 (hope I got that
right this time)?



It's not technically quite the same as opening a terminal, because that runs
within the gui whereas this runs alongside the gui. So it depends on what you're
doing with the command line as to whether it's what you want. But it's certainly
full screen.



Took me ages to find out how to get back to the gui session: CTRL-ALT-F7.