Fedora OS，设置了代理后，yum -y install vim失败，解决办法：
<p>报错信息：</p><p>Fedora Modular 31 - x86_64 12 B/s | 19 B 00:01<br>Errors during downloading metadata for repository 'fedora-modular':<br>- Status code: 404 for http://download.fedoraproject.org/pub/fedora/linux/releases/31/Modular/x86_64/os/repodata/repomd.xml (IP: 10.239.4.100)<br>Error: Failed to download metadata for repo 'fedora-modular': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried</p>
<p><img src="https://img2020.cnblogs.com/blog/2276927/202101/2276927-20210111180225244-1291018626.png"></p>
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<p> 解决办法：</p>
<p>需替换fedora下载源以及更新 源：</p>
<p># su<br># cd /etc/yum.repos.d/<br># mv fedora.repo fedora.repo.backup<br># mv fedora-updates.repo fedora-updates.repo.backup<br># wget -O /etc/yum.repos.d/fedora.repo http://mirrors.aliyun.com/repo/fedora.repo<br># wget -O /etc/yum.repos.d/fedora-updates.repo http://mirrors.aliyun.com/repo/fedora-updates.repo<br># dnf clean all<br># dnf makecache</p>
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<p>参考链接：https://www.jianshu.com/p/79906aca03e0（有更过解决方法汇总）</p><br><br>
来源：https://www.cnblogs.com/pink-123/p/14263437.html
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