Debian 10升级为Debian 11

可以通过ustc升级：官方教程：https://mirrors.ustc.edu.cn/help/debian.html

参考：https://linux.cn/article-13647-1.html

先把/etc/apt/sources.list里的所有行注释掉，然后加上

deb http://mirrors.ustc.edu.cn/debian stable main contrib non-free
# deb-src http://mirrors.ustc.edu.cn/debian stable main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free
# deb-src http://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free

deb http://mirrors.ustc.edu.cn/debian-security/ stable-security main non-free contrib
# deb-src http://mirrors.ustc.edu.cn/debian-security/ stable-security main non-free contrib

sudo apt update
sudo apt upgrade
# 或者 sudo apt full-upgrade?

验证一下是不是升级成功了：

cat /etc/os-release

PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"