I have confirmed that this is a regression in the kernel.
The reason this does not show up as an error with Ubuntu 20.04 but is one on Zorin OS 16, even though Zorin OS is based on Ubuntu 20.04 is because Zorin 16 uses the Ubuntu 21.04 kernel (thereabouts, anyway)...
And sure enough, this graphics card does not work properly on Ubuntu 21.04, either.
The only solution I can see for installing Zorin OS 16 is to install Zorin OS from Command Line only (Or if the Ubiquity installer works under the Safe Graphics option to disable modesetting), then immediately install the stable 5.8 kernel.
Remove the 5.13.0-30 kernel; then boot normally and lock the 5.8 kernel in.
Another solution may be to install the Ubuntu 20.04 OEM kernel.
That seems a little complex, I could do that for me. But I'm doing this for my parents. Is there any way to solve that easily ? Or i have to wait or install another distro ?
For me, it is a measure of frustration in how little I still know about Linux.
Linux Mint is similar to Zorin OS and has the same base. An installation attempt should be pretty quick...
It may help narrow down if it is Kernel or Ubuntu where the issue is.
If it works, it may afford you an operating system...
Honesty, ZorinOS Lite would be perfect.
I searched and no other distros even come close to Zorin in what I want (lightweight, design, ease of use for really new users).
Linux Lite would be great but the design is not great.
And Linux Mint is not as lite.
Since I don't have a great internet connection here I cannot easily test any distro. So I think I will stay with windows until there is a fix, or maybe Linux mint (debian édition) or Linux Lite...
I have only two days left to find out what I will do before leaving for several months. Hard decision for some bugs.
Otherwise, I tried Linux Lite and Linux Mint debian edition and seems to be working fine at first then some of the same issues occured on Linux mint (without compatibility mode) and issues with the installer on Linux lite
In these two distributions I had the same errors :
I get this feeling a lot... trying to help users on this forum...
Can you try booting the Installer LiveUSB, but at the grub where it asks if you want to "try or install Zorin" tap the e key to enter the grub editor.
You should see that option listed at the bottom of the Grub Menu...
After tapping the e key, scan the page looking for "quiet splash"
Once you find it, add the grub parameter pci=noaer to it so that it looks exactly like: "quiet splash pci=noaer"
Exit the editor and continue the boot... see what happens...