昨天在justhost.ru上面购买了一个外国的服务器，为了“减少成本”，我没有配置ipv4，而只有ipv6。然后发现服务器用apt update无法连接镜像源进行更新。后来查了资料才发现，仅ipv6的服务器是无法解析并连接ipv4的域名或地址的，而大多数镜像源可能还是ipv4的，因此需要修改服务器的dns并配置ipv6镜像源。
1，配置服务器的DNS
这里给出一些常用公共dns：
| 供应商 | IPv4 | IPv6 |
|---|---|---|
8.8.8.8和8.8.4.4 | 2001:4860:4860::8888和2001:4860:4860::8844 | |
| Cloudflare | 1.1.1.1和1.0.0.1 | 2606:4700:4700::1111和2606:4700:4700::1001 |
| 阿里云 | 223.5.5.5和223.6.6.6 | 2400:3200::1和2400:3200:baba::1 |
| 清华大学 | 101.6.6.6 | 2001:da8::666 |
打开/etc/resolv.conf这个文件，可以先将其中清空，然后加入下列内容设定dns：
#谷歌 IPv6 DNS
nameserver 2001:4860:4860::8888
nameserver 2001:4860:4860::8844
#阿里云 IPv6 DNS
nameserver 2400:3200::1
nameserver 2400:3200:baba::1
#Cloudflare IPv6 DNS
nameserver 2606:4700:4700::1111
nameserver 2606:4700:4700::1001
任选两个粘贴进去即可，国外的话推荐谷歌和Cloudflare。
2，配置IPv6镜像源
目前找到的就有清华大学镜像源、上海交大镜像源和中科大镜像源支持ipv6，下面贴出Debian 10的镜像配置，其余可以到镜像站官网查看帮助。
清华大学：
# 清华大学-Debian 10软件源
deb https://mirrors.tuna.tsinghua.edu.cn/debian buster main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian buster-proposed-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian buster-backports main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian buster main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian buster-updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian buster-proposed-updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian buster-backports main contrib non-free
# 清华大学-Debian 10安全更新源
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
中科大：
# 中科大-Debian 10软件源
deb http://mirrors.ustc.edu.cn/debian buster main contrib non-free
deb http://mirrors.ustc.edu.cn/debian buster-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian buster-proposed-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian buster-backports main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian buster main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian buster-updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian buster-proposed-updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian buster-backports main contrib non-free
# 中科大-Debian 10安全更新源
deb http://mirrors.ustc.edu.cn/debian-security buster/updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian-security buster/updates main contrib non-free
上海交大：
# 上海交通大学-Debian 10软件源
deb https://mirror.sjtu.edu.cn/debian buster main contrib non-free
deb https://mirror.sjtu.edu.cn/debian buster-updates main contrib non-free
deb https://mirror.sjtu.edu.cn/debian buster-proposed-updates main contrib non-free
deb https://mirror.sjtu.edu.cn/debian buster-backports main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian buster main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian buster-updates main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian buster-proposed-updates main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian buster-backports main contrib non-free
# 上海交通大学-Debian 10安全更新源
deb https://mirror.sjtu.edu.cn/debian-security buster/updates main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian-security buster/updates main contrib non-free
配置完DNS和镜像源，就可以使用apt update进行更新，然后安装软件了！
