Ok let me try
Please stay online 
Sorry I had to go to have my lunch.
Ok it's running
Btw thanks bro
See you soon
Nuh nuh...I am here.
I had gone to have my lunch before...
Oh ok 
Now ,what's next?
Run the command again but no need to install gdm, it's already there.
Use:
sudo apt install zorin-os-desktop gnome gnome-shell
Still that problem
Should I send screen shots
Yes, screenshots are more helpful than stating that "it does not work."
1 Like
Try this:
sudo apt --fix-missing update
and then:
sudo apt install -f
Done, what's next
Still that problem with that command
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