I would not be surprised. I think it is faster reinstall than fix it. Do you have any data on it you need to keep?
It's OK. I backed everything up when I changed OS, and I haven't reinstated anything yet.
Do we need a new thread for that? 
I feel so bad that we can't help fix this for Phil. But alas, I feel, FrenchPress might be right, and a re-install might be required. Maybe something went bad in the initial install, I really don't know.
Normally when people contact us for support on Nvidia related GPU issues, a fix is simply applied by installing the latest Nvidia driver. We don't usually run into extensive issues like this. Gosh I am so sorry Praveen.
I know computer problems all too well, I know the feeling of wanting to pull your hair out. Just know, we are here for you, were not just support forum, were a friendly community of wonderful people. Just know, your not alone.
phil1955
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It is good to know 
make sure you read the section "Before you install".
I really appreciate the help. Any ideas what nest?
Should I go ahead and reinstall? If I do it will be tomorrow before I report back as I'm running out of time.
Surely you can.
I can install Zorin in less than 10 min.
Much faster than Windows 10.
Just make sure that the secureboot is disabled in BIOS.
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FrenchPress, Aravisian just pointed out an error on my part, addressing a person by the wrong name.
Reason? StarTreker still a bit sleepy, not fully awake
Resolution: StarTreker requires lots of coffee.
Apologies Phil
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No problem. I'll let you know how I get on tomorrow.
Cheers, and thanks!
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And you said just yesterday that is the worst thing that can happen in formal letter 
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No kidding! I saw a video on Youtube where a guy was installing Windows 10, and it look like it was going to take an hour. I am like, that is like going back to 1998, things took forever! And if you only had 128MB of RAM, well, good luck to you LOL!
Those were the days, and were happy their gone now! Computers were crashing, and we were cursing. There has never been a better time then today for technology, with Zorin OS on NVME, and PCIE Gen3.
Hazaa! 
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OK. I've reinstalled Zorin 16 Pro. I have exactly the same problem as before.
Here is a screen shot of the additional drivers tab:
As you can see (I hope) all of the drivers are greyed out.
I had two errors while installing:
First error: Installed shim-signed package post-installation script subprocess returned an error exit status 1
Second error: An error occurred while removing package:
E: sub-process usr/bin/dpkg returned an error code (1)
The following packages are in a broken state: [nothing followed this, except an instruction to report it]
Is any of this a help?
Hello Phil! Let me help you.
CTRL ALT T to enter terminal.
sudo add-apt-repository ppa:graphics-drivers/ppa
Now run this command...
sudo ubuntu-drivers autoinstall
Don't forget to restart after this!
Now check your Additional Drivers again, do you have choices now?
StarTreker
Your Tech Support Guru
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This has worked!! The system has rebooted in the correct resolution!
This is now a screenshot of the additional drivers:
I can't thank you enough. The screen now looks as it should.
Also, in settings, I have a choice of resolutions, which I didn't have before.
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Alternative way whas a manual installation, i posted a nice tutorial for that. You can always get up-to-date drivers
The expertise on these forums never ceases to amaze me. Thank you all very much. I you ever need any music theory problems solved, I'm your man.
Cheers, and thank you all again.
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Hello Phill!
Curious, was it my solution that resolved it, cause you have Michel selected? I am glad you got all resolutions available now. I basically provided you the magical fix codes, they work wonders.
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Trekers post should be marked solution as it is the post that actually provided the solution.
This is to help readers and lurkers searching for solutions so that they do not have to wade through all the back and forth trying to find it.
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