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== display manager ==Installing a new display manager should prompt the dpkg-reconfigure tool to launch. If not, run it manually: Run sudo dpkg-reconfigure gdm3 Select the default display manager in the dialog that pops upSwitch your Linux display managerYou can replace “gdm3” with any of the display managers that are currently installed on your system. If this fails, edit the /etc/X11/default-display/manager file with root privileges.