Before doing the upgrade make sure to backup all important files, to avoid any data loss. For this tutorial we’ll only cover the upgrade process, check this tutorial for database
Install tmux
We’ll run the all command under tmux, to make sure the upgrade process keep going even though we have some issue with internet connection.
sudo apt install tmux -y
run tmux from terminal, then connect to linux via SSH
in case the connection drop, open the tmux session again using command
tmux attach
Update Debian 12 (bookworm)
Update all packages for current Debian to the latest version
sudo apt update && sudo apt full-upgrade -y
after done, restart the system
sudo rebootUpgrade to Debian 13 (trixie)
Update main repository to trixie
sudo sed -i 's/bookworm/trixie/g' /etc/apt/sources.list
Update third party repository to trixie
sudo find /etc/apt/sources.list.d -type f -exec sed -i 's/bookworm/trixie/g' {} \;
then update and upgrade the whole packages
sudo apt update && sudo apt full-upgrade -y
it’ll take sometimes to upgrade the packages. After everything done, reboot the server to finalize the upgrade process.
sudo reboot