问题：镜像源报错
在 WSL Debain 系统中使用 apt update 更新软件包时遇到报错
Reading package lists... Done E: The repository 'http://mirrors.tuna.tsinghua.edu.cn/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.
原因：Debian 11 bullseye 于 2024 年 8 月 结束标准支持，部分仓库可能被归档或不再提供
解决方法：升级系统
升级系统到 Debian 12 bookworm，使用新的镜像仓库链接
执行脚本
# 先在旧仓库更新到最新
sudo apt update && sudo apt full-upgrade
# 调整镜像仓库版本
sudo sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list
# 在新仓库完整更新
sudo apt update && sudo apt full-upgrade
sudo reboot
修改后的 sources.list
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-updates main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-updates main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-backports main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ bookworm-backports main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian-security bookworm-security main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian-security bookworm-security main contrib non-free
# deb http://security.debian.org/debian-security bookworm-security main contrib non-free
# deb-src http://security.debian.org/debian-security bookworm-security main contrib non-free
进行安装
安装时可能弹出配置确认界面
这个问题是 Debian系统在升级系统库时，弹出的一个配置提示，即是否重启受影响的系统服务，一般建议选择 YES
