What is the output of sudo apt update
?
You have added several Bionic Repositories to Zorin OS 16. I really wish Online Tutorials would clearly explain that repositories can often only apply to certain releases. Undated Tutorials really cause a lot of confusion in users... And added but broken repositories can confuse apt by redirecting its package search.
We need to remove those non-focal repos:
Ya before some days ago I was trying to install gnome 40 via Ubuntu's ppa😅
So what we have to do now?
Remove unwanted PPAs.
use:
sudo add-apt-repository -r ppa:<ppa to remove>
But how can I know which ppa is not required
We need to remove those non-focal repos:
sudo add-apt-repository --remove ppa:embrosyn/cinnamon
sudo add-apt-repository --remove ppa:noobslab/apps
sudo add-apt-repository --remove ppa:webupd8team/nemo3
You can check the package page - look for Focal release files.
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sudo add-apt-repository --remove ppa:devacom/gnome-41
sudo add-apt-repository --remove ppa:devacom/x11
sudo add-apt-repository --remove ppa:devacom/gnome-40
Ok, once those are removed...
Run
sudo apt upgrade && sudo apt install --reinstall zorin-os-desktop
ok not running
Then what to do?
Please see the edit above - you still have standing gnome40 repositories that are breaking your package management.
Ok understand
Why this update not getting speed
My internet at 4Mbps
I'm not sure; may be heavy traffic on that bandwidth. I can only recommend patience for the moment.
Hopefully @Elegant_Emperor is still available to continue offering you assistance - I must step away from the computer for a while.
Okay, Thanks You Very Much Bro
Yep! 
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I am seeing that for the first time!
Did any error message appear after the installation process in the terminal?