I do not know if I am currently being affected by the same Bug. My system is:
intel i7 3770 (HD4000 igpu)
nvidia GTX 960

I have Kubuntu 18.04 updated to date. I was using 390.48 nvidia proprietary 
driver correctly. I decided to try nvidia-prime in Kubuntu 18.04, so from the 
BIOS I enabled iGPU as the primary display. I opened nvidia-settings GUI and 
from Prime options I chose Intel. After entering user password, it took about a 
minute for the message to appear that the change had been successful. So I 
rebooted the system and it worked correctly, the system was using intel iGPU. 
But then when trying to return to nvidia something went wrong. After rebooting 
the system, PRIME options of nvidia-settings GUI disappeared. nvidia-settings 
GUI is only shown in the minimal version, only items from Application Profiles 
and nvidia-settings Configuration is displayed.
If I select my nvidia as a Primary Display from BIOS, the system enters in 
graphic mode but it apparently is not using nvidia driver, system and graphics 
work very slow and take time to refresh. nvidia-settings GUI just keeps showing 
minimal interface with almost no options. All this despite the fact that from 
the terminal, PRIME is informed that nvidia is selected:
$ sudo prime-select query

I have tried to purge all nvidia package and reinstalling the driver from 
driver manager, but everything remains the same. Since troubleshooting nvidia 
problems is more difficult with new packaging system:

I do not know if I did it right. These are the packages that I currently have 

Just a question to see if I can reverse PRIME changes. Which
configuration file is modified when you select nvidia or intel from
PRIME options in nvidia-setings GUI (after entering user key)?

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  nvidia-prime can't switch off the discrete GPU

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