开源镜像站推荐
https://mirrors.huaweicloud.com/
http://mirror.kaiyuanshe.cn/
http://mirrors.163.com/
http://nudt.dl.360tpcdn.com/data/ubuntukylin-20.10-enhanced-amd64.iso
https://mirrors.huaweicloud.com/
http://mirror.kaiyuanshe.cn/
http://mirrors.163.com/
http://nudt.dl.360tpcdn.com/data/ubuntukylin-20.10-enhanced-amd64.iso