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?

  • I'm certain you could just use display-manager (e.g., systemctl restart display-manager, etc.) – muru Jun 4 at 14:15

It is sddm

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.

Lubuntu Manual

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