how to disable gui for servers

how_to_disable_gui.md

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+# Disable GUI
+# Tested on debian 11
+
+Pretty easy, apparently all is needed is the command:
+
+```bash
+systemctl set-default multi-user.target
+```
+
+And to go back to GUI on boot
+
+```bash
+systemctl set-default graphical.target
+```
+
+
+If the system starts without GUI, but you want to start the 
+GUI at some point, you can use the command:
+
+```bash
+startx
+```