kubuntu-driver-manager application opens to show nothing

Status changed to 'Confirmed' because the bug affects multiple users.

I now have this exact same issue with KUbuntu 19.10.

Device Manager worked fine in KUbuntu 19.04 but then I upgraded to 19.10 (do-release-upgrade) and now get exactly the same hang of the kubuntu-driver-manager

The command "ubuntu-drivers" seems to report info ok
but installing reports an issue

$ sudo ubuntu-drivers install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 nvidia-driver-435 : Depends: libnvidia-gl-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: nvidia-compute-utils-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-decode-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-encode-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: xserver-xorg-video-nvidia-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-cfg1-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-ifr1-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-fbc1-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Recommends: libnvidia-compute-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-decode-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-encode-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-ifr1-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-fbc1-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-gl-435:i386 (= 435.21-0ubuntu2)
E: Unable to correct problems, you have held broken packages

I now have this exact same issue with KUbuntu 19.10.

Device Manager worked fine in KUbuntu 19.04 but then I upgraded to 19.10 (do-release-upgrade) and now get exactly the same hang of the kubuntu-driver-manager

The commands "ubuntu-drivers list" , "ubuntu-drivers debug" and "ubuntu-drivers devices" are ok
but "ubuntu-drivers install" reports an issue

$ sudo ubuntu-drivers install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 nvidia-driver-435 : Depends: libnvidia-gl-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: nvidia-compute-utils-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-decode-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-encode-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: xserver-xorg-video-nvidia-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-cfg1-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-ifr1-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Depends: libnvidia-fbc1-435 (= 435.21-0ubuntu2) but it is not going to be installed
                     Recommends: libnvidia-compute-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-decode-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-encode-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-ifr1-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-fbc1-435:i386 (= 435.21-0ubuntu2)
                     Recommends: libnvidia-gl-435:i386 (= 435.21-0ubuntu2)
E: Unable to correct problems, you have held broken packages

This is happening on my PC running on Kubuntu 19.10. Unlike the previous report, mine returns everything normally on the CLI, but nothing on the GUI.

I am testing the Plasma 5.18 beta and noticed this behavior. I have another 19.10 install that's at Plasma 5.17.5 and it is doing the same thing. The window loads and shows the "Collecting information about your system" message but doesn't get any further. I've left it open for 30 minutes and no change.