Upgrade Debian to latest release

To upgrade Debian to the next release, follow these steps:

1. Backup Your System: Ensure you have a complete backup of your system and important files.

2. Update Current Packages:

   sudo apt update && sudo apt upgrade -y
   sudo apt full-upgrade -y
   

3. Change the APT Sources: Update your /etc/apt/sources.list file to replace bullseye with bookworm. You can use the following command:

   sudo sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list
   

4. Update Package Lists:

   sudo apt update
   

5. Upgrade to Bookworm: Run the upgrade commands:

   sudo apt upgrade -y
   sudo apt full-upgrade -y
   

6. Reboot Your System:

   sudo reboot now
   

7. Verify the Upgrade: After rebooting, check the Debian version:

   lsb_release -a
   

Make sure to read the release notes for Debian Bookworm to address any specific changes or issues.