丽萨主机感觉很慢

听说丽萨主机的 IP 比较干净，整个了一个新加坡的， apt update 都卡死，竟然使用的是 aliyun：

sudo apt update

Hit:1 http://mirrors.aliyun.com/debian bullseye InRelease

Hit:2 http://mirrors.aliyun.com/debian-security bullseye-security InRelease

Hit:3 http://mirrors.aliyun.com/debian bullseye-updates InRelease

Ign:4 http://mirrors.aliyun.com/debian bullseye-backports InRelease

Err:5 http://mirrors.aliyun.com/debian bullseye-backports Release

404 Not Found [IP: 163.181.201.188 80]

Reading package lists... Done

E: The repository 'http://mirrors.aliyun.com/debian bullseye-backports Release' no longer has a Release file.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

N: See apt-secure(8) manpage for repository creation and user configuration details.

sudo apt update 0% [Waiting for headers] 0% [Waiting for headers] 0% [Waiting for headers] 0% [Waiting for headers] 0% [Waiting for headers] 0% [Waiting for headers]^C