fedora yum install 报错

最近在fedora中yum install gdb时报错：

Failed to download metadata for repo 'fedora-modular'
Error: Failed to download metadata for repo 'fedora-modular'

解决方案1：

在/etc/dnf/dnf.conf结尾添加sslverify=0

参考：

http://fossdev.blogspot.com/2015/12/fedora-update-with-dnf-cannot.html

解决方案2：

su
cd /etc/yum.repos.d/
mv fedora.repo fedora.repo.backup
mv fedora-updates.repo fedora-updates.repo.backup
wget -O /etc/yum.repos.d/fedora.repo http://mirrors.aliyun.com/repo/fedora.repo
wget -O /etc/yum.repos.d/fedora-updates.repo http://mirrors.aliyun.com/repo/fedora-updates.repo
dnf clean all
dnf makecache

参考：

https://blog.csdn.net/kajweb/article/details/80202175