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Switch 18.04 to TTY text mode:
sudo init 3 # or use
sudo systemctl isolate multi-user.target

Switch back to graphical mode:
sudo init 5 # or use
sudo systemctl isolate graphical.target

Set TTY text mode as default:
sudo systemctl set-default multi-user.target

Switch back to graphical mode as default:
sudo systemctl set-default graphical.target

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niu.moe

We are a cute and loving international community O(≧▽≦)O !