有些vps/云服务器/独立服务器拿到之后默认还是给的debian11系统，而且还不提供debian12；虽然说用也不是不可以，但是为了安全或者又喜欢追新的话还是升级一下到debian12比较好。这里简单介绍下快速将debian11升级到debian12的方法，如果有数据的话记得提前备份好，避免出现不必要的损失。
默认操作：
apt update && apt upgrade
接下来，完成后复制下面代码，粘贴输入进去：
cat > /etc/apt/sources.list << EOF
deb https://mirrors.huaweicloud.com/debian/ bookworm main non-free non-free-firmware contrib
deb-src https://mirrors.huaweicloud.com/debian/ bookworm main non-free non-free-firmware contrib
deb https://mirrors.huaweicloud.com/debian-security/ bookworm-security main
deb-src https://mirrors.huaweicloud.com/debian-security/ bookworm-security main
deb https://mirrors.huaweicloud.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src https://mirrors.huaweicloud.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb https://mirrors.huaweicloud.com/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src https://mirrors.huaweicloud.com/debian/ bookworm-backports main non-free non-free-firmware contrib
EOF
或者
cat > /etc/apt/sources.list << EOF
deb http://mirrors.linode.com/debian/ bookworm main non-free non-free-firmware contrib
deb-src http://mirrors.linode.com/debian/ bookworm main non-free non-free-firmware contrib
deb http://mirrors.linode.com/debian-security/ bookworm-security main
deb-src http://mirrors.linode.com/debian-security/ bookworm-security main
deb http://mirrors.linode.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb-src http://mirrors.linode.com/debian/ bookworm-updates main non-free non-free-firmware contrib
deb http://mirrors.linode.com/debian/ bookworm-backports main non-free non-free-firmware contrib
deb-src http://mirrors.linode.com/debian/ bookworm-backports main non-free non-free-firmware contrib
EOF
国内机器选择前面华为的源，国外的推荐选择linode的源，然后回车。
再就是下一步、下一步…
最后重启系统！
debian 9 升级 debian 10 ：https://www.zhujiceping.com/37040.html
debian 10 升级debian 11：https://www.zhujiceping.com/64312.html
debian 11升级 debian 12：https://www.zhujiceping.com/70432.html
