Can not install brew because it is not currently available from the software update server

I’ve followed the steps on the website: /usr/bin/ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”.
However, I’m not able to install the brew. The system give me error: it is not currently available from the software update server.
I’m a new Mac user and I don’t know what to do here.
Thanks in advance!

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