I downloaded lightdm for my ubuntu 18 (aarch64), installed it and set it as default. When I type

   cat /etc/X11/default-display-manager

this is the output


But desktop is still gdm3 even if I restart pc. Why?enter image description here


lightdm and gdm3 are "Displaymanagers" not "Desktop environments".

Unless you install another Desktop Environement like KDE or i3, neither of the two Displaymanagers can offer you any choice and will send you to the one Desktop Environment you have available: Gnome.

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