debian系统换源+升级（10、11、12）
debian的升级其实是可以非常简单的，接下来介绍的是将debian从10升级到11，debian11升级到12的办法，核心就是切换到一个高速的源即可了，然后就是apt update && apt upgrade ，一切都是那么简单。如果你在不切换源的情况下，还需要更新一些debian变动过的东西，还是比较麻烦的！
Debian 10 升级11
cat > /etc/apt/sources.list << EOF
deb http://mirrors.linode.com/debian bullseye main
deb-src http://mirrors.linode.com/debian bullseye main
deb http://mirrors.linode.com/debian-security bullseye-security/updates main
deb-src http://mirrors.linode.com/debian-security bullseye-security/updates main
deb http://mirrors.linode.com/debian bullseye-updates main
deb-src http://mirrors.linode.com/debian bullseye-updates main
EOF
国内源
cat > /etc/apt/sources.list << EOF
deb https://mirrors.huaweicloud.com/debian bullseye main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian bullseye main contrib non-free
deb https://mirrors.huaweicloud.com/debian-security/ bullseye-security main
deb-src https://mirrors.huaweicloud.com/debian-security/ bullseye-security main
deb https://mirrors.huaweicloud.com/debian bullseye-updates main
deb-src https://mirrors.huaweicloud.com/debian bullseye-updates main
EOF
debian11升级12
国外源
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
国内源
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