I got
[ 1.289440] [drm] amdgpu kernel modesetting enabled.
[ 1.289609] [drm] This hardware requires experimental hardware support.
Are you using the generic kernel or HWE (HardWare Enabled kernel)?
uname -a
You may need to install the mainline HWE or DRM kernel. Before trying that, I would suggest trying the /etc/gdm3/custom.conf edit above, anyway. If you have not tried that yet, I would still consider it a reasonable chance of working.
Otherwise, you can install the MainLine Kernels you need through Synaptic Package Manager to make it easier:
sudo apt install synaptic
Or
https://www.cyberciti.biz/faq/howto-upgrading-the-ubuntu-linux-kernel/
I am sorry about the links- I am majorly multi-tasking at the moment and trying to reply to posts quickly.
Here is what I got from the uname command
Linux IdeaPad-Flex-5-14ARE05 5.4.0-73-generic #82~18.04.1-Ubuntu SMP Fri Apr 16 15:10:02 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
I will try the edit and then come back to you.
Ah, Lenovo Ideapad... Lenovo "pad"s are notoriously finicky on Linux these days. They did not used to be...
It's run every other Linux fairly well. Anyway, no change.
Then at this point, I can only suggest you either try Reinstalling Zorin OS or check the Mainline kernel.
Zorin OS should come with the HWE Kernel... It is built off of Ubuntu as a base just like Mint and many other distros. So if "every other Linux" runs well, I would suspect a corruption occurred during the OS installation. If this is a fresh install, then a reinstall may be painless.
Luckily I just installed it today and have mostly nothing installed yet so... I'll update you in a bit.
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And back. Did not see the gear icon on login. Currently doing updates.
Hmmm... is this Zorin OS LITE that you are installing?
Nope, Core 15.3. Just finished updates and there are no changes.
And... you ARE clicking the Gear Icon, right?
In the log in screen? There is no gear icon to click.
This is an Ubuntu screen as I cannot easily find a Zorin one- but the GDM3 layout is the same:
Yeah, it's not there.
You may try reinstalling GDM3, but I doubt that is the issue as you just did two fresh installations of the system. Other than that, I can think of no reason that the desktop environment selection icon could be missing.
On my copy of Zorin Core, the icon shows the option for "Zorin on Wayland".
I attempted the /etc/gdm3/custom.conf edit and there was no change, and also checked uname -a and there were no changes there. It's possible switching to Wayland won't actually solve my issues (slow UI, no animations, screen tearing
I could try installing Lite but I'm pretty sure my laptop should be able to handle Core without issue.
What Graphics card does your notebook have?
Radeon RX Vega 6 integrated (CPU is Ryzen 5 4500u)
You might try upping the graphics drivers;
sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt update
sudo apt full-upgrade
Then reboot and test to see if you UI is properly responsive.