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I recently updated to Kubuntu version 16.04 from version 14.04 after getting the upgrade notification. It successfully downloaded and installed, but after rebooting the system, it went straight to a terminal login screen. Even after successfully logging in, the GUI doesn't auto-load.

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can you get the GUI to start by pressing ctrl+alt+F7? Or by typing the command startx? – Zanna Sep 3 '16 at 5:34
    
I tried ctrl+alt+F7 first and that just sent me to a black screen, but the startx command did launch the GUI after I logged in on the terminal. Thank you for the help! – Tornado118 Sep 5 '16 at 20:49
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Do you have to do that every time, or do you get a normal GUI login screen now? – Zanna Sep 5 '16 at 20:50
    
@Tornado118 have you tried the answer given? – Anwar Sep 7 '16 at 14:14
    
I apologize for being so long in getting back. Yes Zanna, I have to type it every time I restart the system. – Tornado118 Sep 13 '16 at 3:38
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While you're on terminal after boot, install sddm. 

sudo apt-get install sddm

This will install the required display manager for KDE and you'll be presented with graphical login after reboot.

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I did this but it said that it was already installed. – Tornado118 Sep 14 '16 at 0:42
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If there is a file located under ~/.Xauthority remove that file rm ~/.Xauthority then start your machine sudo reboot

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