Upgrade debian11 to debian12 easily and quickly

Foolish tutorial for upgrading Debian 11 to 12: Debian has also gained a new wave of fans since CentOS was discontinued, and its team has grown. Currently, debian12 is out, so hurry up and give it a try. Let’s upgrade debian11 to debian12 simply and quickly. The general steps are as follows:

Update the existing system first:

apt update && apt upgrade

Modify the source of debian11 to debian12:

If it is a Hong Kong machine or a mainland machine, it is recommended to use Huawei's source. Just copy the following code and press Enter:

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

If the machine is in Europe, America or other places, it is recommended to use the linode source, just copy the following code and press Enter:

cat > /etc/apt/sources.list << EOF

deb http://mirrors.linode.com/debian bookworm main non-free-firmware

deb-src http://mirrors.linode.com/debian bookworm main non-free-firmware

deb http://mirrors.linode.com/debian-security/ bookworm-security main non-free-firmware

deb-src http://mirrors.linode.com/debian-security/ bookworm-security main non-free-firmware

deb http://mirrors.linode.com/debian bookworm-updates main non-free-firmware

deb-src http://mirrors.linode.com/debian bookworm-updates main non-free-firmware

EOF

Continue updating and upgrading:

apt update && apt full-upgrade

There will be several pauses during the period. The first time you have to enter "q", the rest are all "y"

Finally restart the system:

reboot

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