I used to do
sudo service lightdm restart
under Lubuntu 18.04 LTS to solve blackscreen problems sometimes. Now that lightdm is gone in Lubuntu 20.04 LTS,
what is the service equivalent to
lightdm above that I can use in 20.04?
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sddm is the default display manager that shows up when you first log in to Lubuntu or logout or choose to another session. There is no graphical application to do this currently.