Running Linux in Headless Mode

If you're connecting via SSH and don't need a graphical interface (GUI), you can switch your system to headless (text-only) mode to save resources. Follow these steps:

1. Check the current default target (runlevel):

   systemctl get-default

2. Set the default target to text mode (multi-user.target):

   sudo systemctl set-default multi-user.target

3. Disable the graphical display manager:
   (Choose the appropriate command based on your system.)

   • For systems using gdm3 (GNOME Display Manager):

     sudo systemctl disable gdm3

   • For systems using lightdm:

     sudo systemctl disable lightdm

4. Reboot your system for the changes to take effect:

   sudo reboot

Note: After rebooting, your machine will start without launching the GUI, providing a pure command-line environment. To restore the GUI later, you can set the default target back to graphical.target and re-enable your display manager.