I am used to ctrl-alt-Fn (say, ctrl-alt-F3) to get a terminal CLI console scrolling screen. On 20.04 LTS (MATE Xwindow environment), the default ctrl-alt-F1 is the (dark pink) login screen, ctrl-alt-F2 is the Xwindow MATE screen, but the rest do not produce a login prompt but merely a dark "blank" screen. How does one enable these other consoles with a login CLI (e.g., bash)? Neither a web search engine search nor a Search on Ask Ubuntu has found the answer, possibly because I am not using the currently correct search target words. Take care. Stay safe.
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The answer is in Enable Ctrl+Alt+F1 Virtual Consoles in GNOME (Ubuntu 17.04+)
The solution of modify /etc/systemd/logind.conf, uncomment NAutoVTs=6 and restart.
Also, check /etc/default/console-setup, the line: ACTIVE_CONSOLES="/dev/tty[1-6]"
works on 20.04 LTS, but a reboot is required -- a systemctl as further in the answer I found locks the GUI Xwindow screen, requiring a reboot, at least when I just tried it as root.
Yasha Karant
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