I had logged into Ubuntu 18.04.4 desktop, then I pressed Alt-Ctrl-F3 to get a TTY and logged in there.
At some point I look up and see the last of the boot messages and Alt-Ctrl-F2 does not get me back to the GUI login.
I can't get anything to change but my programs are still running on my desktop.
What mysterious key did I press and what do I hit to get back?
At this point I would have to power off, and I don't want to lose my work.