Nothing. No error nothing. Just executed the command
Ok, this means that lightdm is not the cause.
I am sorry but my memory fails me: What Graphics card are you using?
Thanks, ok can you try in terminal
sudo apt-get install mesa-utils
Then reboot and test.
If no luck after that, I can only suggest changing the kernel to an earlier version or a much later one- and then I have run out of ideas.
it says mesa-utils is already the newest version (8.4.0-1).
Ok, in that case, take the second VGA monitor and grab a hammer…
Any ways Thanks for all your efforts… 
Aside from Possibly the Kernel being updated to 5.6 or to 5.0
I do not know what else to suggest. I am at a loss.
You can use the earlier Free Versionof Ukuu to change the kernel
https://github.com/teejee2008/ukuu/releases/download/v18.9.1/ukuu-v18.9.1-amd64.deb
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Okhayy…maybe I will do it later
I resisted posting any flippant remarks whilst you two were seriously in middle of that investigation. But that was my exact question the first time I drove a car in USA. 
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Dayyum… i was about to close this tab and I saw you “replying” for like 5 mins. I was hoping some answer…
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LOL I did the same thing. I sat here and waited…
I guess we should have yielded the Right of Way.
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I am really sorry to have raised your hopes. I’m not that good.
Edit:
I now feel guilty keeping you both in suspense before, so have started doing some searches.
This refers to dell and nvidia graphics, but just looking for something that may trigger a spark that may lead towards an ultimate solution.
I have gone back through this thread and can see no reference to “secure boot” question. That seems to be a solution turned up here:
https://www.dell.com/community/Precision-Mobile-Workstations/External-Monitor-not-working-Ubuntu-nvidia/td-p/6241315/page/2
I don’t expect anyone on Zorin to have “secure boot” set, so probably a dead end.
Don’t know if anything elese in that dell thread may trigger any urika! result.
More:
But refers to Ubuntu MATE 18.04.
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@zabadabadoo Appreciate your efforts…
@Aravisian Maybe this will help
Didn’t read the whole thing as i didn’t understand much
Marked solution. 4
HELP! I really need my docking station to be recognized by all my Zorin laptops!!! I have several older laptops using Zorin OS 16 [Lenovo T430 & X220, Toshiba Satellite, HP Pavilion and Dell Inspiron]. None of them recognized my docking station.
I have a USB Docking Station GIQ USB C hub USB 3.0 to Dual HDMI VGA Adapter Triple Display USB C Laptop Docking Station Dual Display
hey can you tell me will this work now in latest version of zorin