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Having Kubuntu 16.04 LTS for half a year, I have performed the following innocent sudo apt-get upgrade, which resulted in installation of plenty of packages. After this upgrade the design of a login screen changed and I could not get over it. Logging in, I would get the black screen and a total freeze of the computer.

  • First hypothesis was that the issue is caused by malfunction of nVIDIA drivers, which was rejected after plenty of hopeless attempts to reinstall drivers.
  • I also tried to reinstall kubuntu-desktop, plasma-desktop, xorg, sddu without any observable result.
  • I tried sudo dpkg --configure -a as well with no positive result.

Luckily, I have spotted that the ~/.Xauthority file has wrong permissions and following the advice to delete that file I got one step further. Can't login to Ubuntu 16.04 after upgrade

Now, I can log in (and luckily work). I get a black screen and a cursor. I see no tool bar at the bottom of the screen, no widgets, no wallpaper. The system has forced a new theme of windows called Breeze. I have to get the Internet connectivity by myself in terminal via nmcli n off; nmcli n on. I can run all applications using alt + F2 runner. But the start up of the applications is very slow. Shutting down the system is extremely slow as well.

Can anyone give me a good advice which part of the system is responsible for this issue and how to fix it?

Thank you very much in advance.

Břetislav Šopík
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1 Answers1

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The solution to this problem was to add a repository with a new plasma desktop release and reinstall it fully from this repository:

sudo apt-add-repository ppa:kubuntu-ppa/backports
sudo apt update && sudo apt full-upgrade -y

For more info see: http://www.omgubuntu.co.uk/2016/05/install-latest-plasma-desktop-kubuntu-16-04

Břetislav Šopík
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