I skipped the upgrade step for simplicity as it can take a while and I didn’t find it necessary for getting Pico dev up and going. I guess I’m making the assumption that folks are working with a newly set up Linux install like I was - did you need to upgrade yours before it would work?
If Git asks you for a username and password it might be because you’ve got a typo in the URL - I can’t make out the exact command that you’re entering as the forum has added some unhelpful formatting to the URL. If you enclose the code in backticks (`) it should stop it from doing that, or you could post a screenshot/photo of the error?
I didn’t try any of it, not into programing in C.
As you mentioned making a typo will get you the password prompt, been there done that. It’s a head scratcher until you figure out your blunder.