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Error: Failed to download metadata for repo ‘AppStream‘: Cannot download repomd. XML solution
2022-07-04 12:34:00 【Fairy Pavilion】
Recently, we are using Alibaba cloud ESC This error occurred when the server went to download the software , Finally, I found the answer in the official 
resolvent
‘https://help.aliyun.com/document_detail/405635.html?spm=5176.smartservice_service_chat.0.0.712c3f1bBoZ19I
Follow the steps to solve it In fact, the third-party mirror stations have been removed CentOS 8 Source
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