Make a complete backup of your system or virtual machine snapshot before you start
Update Current Packages
root@rpi-iot-jsho-cam-02:~#
root@rpi-iot-jsho-cam-02:~# apt-get update -y
root@rpi-iot-jsho-cam-02:~# apt-get upgrade -y
root@rpi-iot-jsho-cam-02:~# apt-get dist-upgrade -y
Reboot your system to apply the latest Buster change
Update Repository Sources replace every instance of the word buster with bullseye
root@rpi-iot-jsho-cam-02:~# vi /etc/apt/sources.list
Run the Upgrade to Bullseye update your package index with the new Bullseye repositories
root@rpi-iot-jsho-cam-02:~# apt-get update
Run a minimal upgrade first to prepare system dependencies
root@rpi-iot-jsho-cam-02:~# apt-get upgrade –without-new-pkgs
Perform the complete distribution upgrade
root@rpi-iot-jsho-cam-02:~# apt-get full-upgrade
Remove obsolete installation files
root@rpi-iot-jsho-cam-02:~# apt-get autoclean
Reboot your system to apply the latest Bullseye change