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, sdduwithout any observable result. - I tried
sudo dpkg --configure -aas 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.
