For the new version elementary 5.1 Hera the correct command to launch a termianl is io.elementary.terminal -n


The worst is that noone mentioned that you must use alt+ctrl+F1 to F6 to switch to terminal. Login there as standard user. Restart x with sudo command and then press alt+ctrl+F7 to go back to GUI.


On Ubuntu 18.04, I do this executing next command: sudo systemctl restart lightdm

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