Ubuntu: Kubuntu 16.04 black screen after installing a different graphical login screen display manager


I'm using Kubuntu 16.04. After installing the lightdm graphical login screen display manager, when booting it goes to a black screen. How do I fix this so that Kubuntu will boot normally?


A display manager is a program that provides graphical login capabilities for the X Window system. Change the display manager from lightdm back to the default Kubuntu display manager, kdm. Open the terminal and type:

sudo dpkg-reconfigure lightdm  

This will open up a new window allowing you to select either kdm or lightdm as the default login display manager.

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