清华： https://mirror.tuna.tsinghua.edu.cn/kernel/v5.x/ https://mirror.tuna.tsinghua.edu.cn/
网易： http://mirrors.163.com/ubuntu-releases http://mirrors.163.com/
阿里： https://developer.aliyun.com/mirror/ https://mirrors.aliyun.com/linux-kernel/?spm=a2c6h.13651104.0.0.7e8937382FyMTn
