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I'm not sure, but lightDM doesn't seem to work
go to Preferences -> KDE.System.Settings (in the menu)
In the Login Screen (SSDM) setting there is a checkbox for Auto Login. Ensure the check-box is clicked and your username should become easily readable.
USE SDDM which comes standard in lubuntu 18.10
Had to edit /etc/sddm.conf
Here is an example sddm.conf:
Required, but never shown