Whatever you do, do not upgrade gnome... at all. The libraries should not be an issue at all... mainly gnome. Gtk libraries could be an issue.
Alright! Installation of 5.16 was successful. However, booting only possible with nomodeset. I think I should also test 5.17 so.
I would. Once you get somewhere (5.17 or 5.18) i would fine tune within that version (5.17.0.40 i.e.)
Unbelievable. With 5.17 not only it worked immediately, booting is even faster. I immediately received 4K resolution and both screens were detected.
Shall I now remove the repo for the mainline installer? Will Zorin OS ask me for upgrading Gnome in future? Because you said it should not be upgraded.
Thank you so much! 
Remove the "jammy" repo prior to any updates. Once that is done, if you see an update for a kernel lower than yours, do not upgrade... you will have to mark the current kernel for hold, only if that occurs.
What version of 17? You can get it with uname -r
I hope all will run stable, no freezes or so. Thank you very much 
I used the latest version of 5.17:
5.17.15-051715-generic
I would stay within that version, upgrade through .15+ if a few things aren't working (hwe and such) if you need. 5.18 possibly if you can't wait for the next subversion.
You removed the jammy repo? This is important!
sudo add-apt-repository remove "deb http://ca.archive.ubuntu.com/ubuntu jammy main" i believe.
Yes, I'll keep that! The jammy repo I immediately removed after installing libssl3
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Please mark the solution that fixed your machine and take a gander in the tutorials section for many more helpful guides.
The mainline repo will not update or hurt anything....i would leave it for now. Use [HOW TO] Easily reinstall programs when Reinstalling Zorin to backup applications and home easily for reinstall. Use rescuezilla and timeshift to backup everything (recommended now that it works).
Please open a new thread. This is for both your benefit and that of anyone that reads this thread.
Go through your normal operation, you may end up including a few other things. Once you have done a few things you normally do, evaluating as you go, create the thread with those issues you find.
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