To upgrade a Debian 10 (Buster) system to Debian 11 (Bullseye) using the command line interface (CLI), you can use the apt-get package manager and the do-release-upgrade command.
It is important to note that upgrading a system from one major release to another (e.g., from Debian 10 to Debian 11) can be a risky process, and it is important to follow the instructions carefully to avoid causing any damage to your system. It is also a good idea to back up your important data before proceeding with the upgrade.
Here are the steps to upgrade a Debian 10 system to Debian 11 using the CLI:
Open a terminal window and log in to the system as the root user.
Run the following command to update the package manager's list of available packages:
apt-get update
apt-get upgrade
update-manager-core package, which is required for the release upgrade process:apt-get install update-manager-core
/etc/apt/apt.conf.d/50unattended-upgrades file and change the Unattended-Upgrade::Allowed-Origins line to the following:Unattended-Upgrade::Allowed-Origins {
"${distro_id}:${distro_codename}-security";
};
This will allow the release upgrade process to install packages from the security repository.
do-release-upgrade
This command will start the release upgrade process and guide you through the steps to upgrade your system to Debian 11. Follow the prompts to complete the upgrade process.
Once the upgrade process is complete, you will need to reboot the system in order for the changes to take effect. To reboot the system, run the following command:
reboot
For more information about upgrading a Debian system from one major release to another, you can consult the documentation for do-release-upgrade or visit the Debian website.