How I made tty1 a live display for (Systemd’s) journal (in Ubuntu 20.04)

1. Run systemctl edit getty@tty1.service
2. In the override file, enter

   [Service]
   ExecStart=
   ExecStart=-/bin/journalctl -b -ef
   StandardInput=tty
   StandardOutput=tty

3. To see it right away (without reboot), run systemctl daemon-reload followed by systemctl restart getty@tty1.service
4. To stop the console from blanking, edit /etc/default/grub, add consoleblank=0 to GRUB_CMDLINE_LINUX_DEFAULT, save and exit. Then run update-grub and reboot.

(I adapted the service override from Remy’s old post.)