If not doing a
sudo apt update first, it seems to create a lot of issues, and not everyone can have the patience and time to come to purism forums and search for a solution. I’d see this as an important issue and I’d suggest at least informing people about the need of running this command right after they install the OS. Sure fixing the issue at its roots would be better but I’d guess that the team is very busy atm and you might not have the time fixing it.
By “informing people” I mean adding a temporary slide to the OS installation process, warning them about the issue and listing the steps needed to take in order to fix it. Few lines of text, not more - but they can do a lot imo. Cheers!