Hi,
I too had the same problem and after some digging I found out that the file 
from which the service runs is:
/etc/systemd/system/display-manager.service.wants/nvidia-prime-boot.service

the service used vgaswitcheroo module to switch off the dGPU. However I
think most of use i915 or modesetting driver which doesn't give the
"vgaswitcheroo" module.

I changed my file to the attached copy.

Basically instead of using vgaswitcheroo, you can use 
   "echo 'auto' > '/sys/bus/pci/devices/0000:01:00.0/power/control'" to switch 
off your dGPU.


** Attachment added: "Modified service file"
   
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1763978/+attachment/5118361/+files/nvidia-prime-boot.service

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Title:
  nvidia-prime-boot.service: Main process exited, code=exited,
  status=2/INVALIDARGUMENT

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