I have been following the directions here https://ubuntu.com/download/raspberry-pi
But, when i get to the final step "sudo apt-get install xubuntu-desktop"
For each of hundreds of files it says "Failed to fetch [filename] and finishes with 'Unable to fetch some archives, maybe run "apt-get update"'
So i run apt-get update and that too generates a bunch of errors like this Err 4: "Temporary failure resolving ports.ubuntu.com"
The tutorial seems quite confident those steps should work. I'm reading about proxy issues when i google the error messages. i don't have a proxy, seems more likely that the wifi is not working.
Any suggestions or should i just try a different flavor of linux?
I'm using a raspberry pi4 model b The Ubuntu image is ubuntu-19.10.1-preinstalled-server-arm64+raspi3.img
thanks