完美解决CentOS8 yum安装AppStream报错

用阿里云的服务器下载宝塔时候出的错,网上的办法普遍不好用,最后在上边的链接给的方案解决了,报错在下面👇

Repository extras is listed more than once in the configuration
CentOS-8 - Base - mirrors.aliyun.com             77  B/s | 2.3 kB     00:30    
Errors during downloading metadata for repository 'base':
  - Status code: 404 for https://mirrors.aliyun.com/centos/8/BaseOS/x86_64/os/repodata/repomd.xml (IP: 42.81.213.230)
  - Curl error (28): Timeout was reached for http://mirrors.aliyuncs.com/centos/8/BaseOS/x86_64/os/repodata/repomd.xml [Connection timed out after 30000 milliseconds]
  - Status code: 404 for http://mirrors.cloud.aliyuncs.com/centos/8/BaseOS/x86_64/os/repodata/repomd.xml (IP: 100.100.2.148)
错误:为仓库 'base' 下载元数据失败 : Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
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