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Force Ubuntu to display login screen on external display
I'm using my laptop docked and the external monitor is the only active display. So the internal is set off atm. By default the login screen does not appears on the external display for some reasons.
Here's a workaround:
sudo cp ~/.config/monitors.xml ~gdm/.config/monitors.xml
sudo chown gdm:gdm ~gdm/.config/monitors.xml
Additional workaround to start login screen on X11 instead Wayland:
Uncomment WaylandEnable=false in /etc/gdm3/custom.conf file.
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