I updated my kubuntu from 17.04 to 18.04 by updating to 17.10 and directly continuing to 18.04
After reboot Plasma didn't come up, but luckily via alt + F2 I get a bash.
I have a Dell Latitude E5450 with a Nvidia GeForce 840M, latter is a plain pain in the ass since I got this laptop. So I strongly suspect that it is the culprit this time, too.
sudo ubuntu-drivers devices
- nvidia-390 as recommended
- nouveau as open source driver
I tried all of them and every time I get stuck with a black screen and a cursor, which doesn't even blink.
How can I check if the culprit is really the graphics card (again....) or something else? Which log do I have to check?
And if it is in fact the graphic card, has someone ideas how to solve this mess?
This question seems to solve the problem for Gnome, but I use kde: No GUI after Kubuntu 18.04 LTS upgrade from 17.10
sudo apt-get --reinstall install plasma-desktop
Hasn't got any effect.