Hi JunkYard
First of all, I deleted your last post. All you did was quote a bunch
of other posts without saying anything else.
There is nothing wrong with the terminal. I works just fine.
Did you plug a network cable into your machine?
You can't download any extensions without a network connection.
There is an icon for a GUI based extension downloader/installer:

It won't work without a network connection either.
A few more items:
1. You will need to manage your expectations. If you expect to
point and click your way to a fully equipped system, then you
picked the wrong Linux distro.
2. You are confusing:
"this is rubbish and nothing works"
with:
"I don't know or understand how things work"
Your current issue is the latter.
3. Stop quoting entire posts. If you need to address an issue from
a post, just quote the sentence that mentions that issue.