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Debian Upgrade

Upgrade debain11 to debain12:

  1. 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
  2. Update the packages index on Debian Linux, run: sudo apt update
  3. Prepare for the operating system minimal system upgrade, run: sudo apt upgrade --without-new-pkgs
  4. Finally, update Debian 11 to Debian 12 Bookworm by running: sudo apt full-upgrade
  5. Reboot the Linux system so that you can boot into Debian 12 Bookworm