Black screen after installing KDE desktop environment in Ubuntu 20.04

After working for some time in GNOME I was thinking about switching to KDE. I upgraded a laptop without much issues, so I went for the desktop as well.

As recommended (and tried before on the laptop) I issued the following command:

herman@HI-desktop:~$ sudo apt install kubuntu-desktop

.. and the installation went fine. After a reboot I was greeted with a nearly black screen I did manage to login to the KDE DE and find the screen settings (see attached screenshot).

My system is a Ryzen 7 system with an GTX 1050Ti video card. I have the feeling that this is a compatability issue with the video card but I am just guessing.

Could anyone please tell me what is going on?

You might try replacing GDM with SDDM. KDE tends to be happier that way. Also, your KDE session may have been running in Wayland. KDE often works better in Xorg. Wayland has more maturing to do WRT DEs other than Gnome, and probably does less so with Gnome too.

Thanks mrmazda! I did opt for sddm when installing KDE. However I did run GNOME in Wayland before installing KDE. Now I switched to KDE it might be trying to run on Wayland as well.

I'll try to switch to Xorg.