我在 vult 服务器上。已安装 LiteSpeed CyberPanel。更新到 Ubuntu 23.04 后，当我尝试更新时，我开始收到此错误：
root@roble:~# sudo apt-get update
Ign:1 https://mirror.insacom.cl/mariadb/repo/11.0/ubuntu lunar InRelease
Ign:2 http://security.ubuntu.com/ubuntu lunar-security InRelease
Ign:3 http://us.clouds.archive.ubuntu.com/ubuntu lunar InRelease
Ign:4 http: same as previous lunar-updates InRelease
Ign:5 http:same as previous lunar-backports InRelease
Ign:1 deleted due to post restriction /mariadb/repo/11.0/ubuntu lunar InRelease
Ign:2 deleted due to post restriction lunar-security InRelease
Ign:3 deleted due to post restriction lunar InRelease
Ign:4 deleted due to post restriction lunar-updates InRelease
Ign:5 http://us.clouds.archive.ubuntu.com/ubuntu lunar-backports InRelease
Ign:1 deleted due to post restriction lunar InRelease
Ign:2 http://security.ubuntu.com/ubuntu lunar-security InRelease
Ign:3 deleted due to post restriction lunar InRelease
Ign:4 deleted due to post restriction lunar-updates InRelease
Ign:5 deleted due to post restriction lunar-backports InRelease
Err:1 https://mirror.insacom.cl/mariadb/repo/11.0/ubuntu lunar InRelease
Temporary failure resolving 'mirror.insacom.cl'
Err:2 http://security.ubuntu.com/ubuntu lunar-security InRelease
Temporary failure resolving 'security.ubuntu.com'
Err:3 deleted due to post restriction lunar InRelease
Temporary failure resolving 'us.clouds.archive.ubuntu.com'
Err:4 deleted due to post restriction lunar-updates InRelease
Temporary failure resolving 'us.clouds.archive.ubuntu.com'
Err:5 deleted due to post restriction lunar-backports InRelease
Temporary failure resolving 'us.clouds.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.clouds.archive.ubuntu.com/ubuntu/dists/lunar/InRelease Temporary failure resolving 'us.clouds.archive.ubuntu.com'
W: Failed to fetch deleted due to post restriction Temporary failure resolving 'us.clouds.archive.ubuntu.com'
W: Failed to fetch deleted due to post restriction Temporary failure resolving 'us.clouds.archive.ubuntu.com'
W: Failed to fetch deleted due to post restriction Temporary failure resolving 'security.ubuntu.com'
W: Failed to fetch deleted due to post restriction Temporary failure resolving 'mirror.insacom.cl'
W: Some index files failed to download. They have been ignored, or old ones used instead.
我读了其他帖子，检查了一下sources.list，似乎没问题。检查了链接，运行正常。
我做了一个ping并收到此错误：
root@roble:~# ping us.clouds.archive.ubuntu.com
ping: us.clouds.archive.ubuntu.com: Temporary failure in name resolution
root@roble:~# ping ubuntu.com
ping: ubuntu.com: Temporary failure in name resolution
知道如何修复它吗？