debian buster netinstall doesn't let me apt-get update

[onlineaddy]

I installed a netinstall.iso of the latest Debian 10.7 Buster. Everything went well during the installation, I configured my wifi, selected my local country mirror for the updates, the installer downloaded everything but after a reboot and login I can't update apt. I continually get some errors ("failed to fetch.." or "some infex files failed to download". What can I do to fix this?

I already tried editing sources.list with the official Debian Buster info, but I still get the same error, can't connect. Even if I plug in cable internet in my laptop.

Could anyone help? Thank you.

# apt-get update
Err:1 http://deb.debian.org/debian buster InRelease
Temporary failure resolving 'deb.debian.org'

[CelticWarrior]

"Temporary failure resolving 'deb.debian.org'" suggests a DNS problem.

[ajgreeny]

Let's see the what the content of your /etc/apt/sources.list now is with the output of terminal command

cat /etc/apt/sources.list

What were the edits you made to the file?
Do you actually have an internet connection; are you using the debian install to write this forum post/thread?
Does the rest of the system appear to work correctly?