Fixing Failed to Download Metadata for Repo 'AppStream' error

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Below is a simple guide to fix Failed to Download Metadata for Repo 'AppStream' error
The whole thing is to replace the repo.

We start the terminal and spend 2 command:

1
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

1
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

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