There black screen with Kubuntu logo appears and it never goes to complete shutdown. It happens always. I always shut it down by power button on laptop.
Machine: Dell Inspirion 3542.
Are you sure this issue is caused by KDE software? If you have done investigations, please add the results here. If not, I suggest to ask in a forum of your distribution how to investigate such issues.
I recently tried another Ubuntu flavors: it's everywhere. Sorry.
Thanks for the update; changing status.