Debian Upgrade

Upgrade debain11 to debain12: 
 
 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