解决 failed to download metadata for repo 'AppStream'
原由
初学centos，使用yum install xxx 命令时，一直报错shell
failed to download metadata for repo 'AppStream'
网上各类搜索方法都是不行的centos
解决这个问题的正确姿式
网络链接问题，连不上外网，就这么简单
不信你ping一下百度试试
我在使用vbox的时候网络设置错误致使的，设置正确后就没问题了，别听其余博客里说的各类删东西
以上网络
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