Upgrade Debian 11 to Debian 12 Bookworm
The procedure is as follows:
- Backup the system.
- Update existing packages and reboot the Debian 11 system.
- Edit the file /etc/apt/sources.list using a text editor and replace each instance of bullseye with bookworm.
Next find the update line, replace keyword bullseye-updates with bookworm-updates.
Finally, search the security line, replace keyword bullseye-security with bookworm-security. - Update the packages index on Debian Linux, run:
sudo apt update
Prepare for the operating system minimal system upgrade, run:
sudo apt upgrade --without-new-pkgs
- Finally, update Debian 11 to Debian 12 Bookworm by running:
sudo apt full-upgrade
- Reboot the Linux system so that you can boot into Debian 12 Bookworm
- Verify that everything is working correctly.