How to disable or enable the GUI when the Ubuntu desktop starts

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The following command will disable the GUI on boot, so on reboot the system will boot to the multi-user target:

$ sudo systemctl set-default multi-user


Restart or logout from the current session to quit the GUI:

$ gnome-session-quit


How to enable GUI at startup

Since you have installed GUI on Ubuntu 20.04 server/desktop, you can enable GUI to start at system startup by executing the following command:

$ sudo systemctl set-default graphical


Manually start the GUI from the command line

For GNOME GUI installations with the default display manager GDM, you can start the GUI from the command line by executing the following command:

$ sudo systemctl start gdm3


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