Upgrade Debian 10 to Debian 11 Bullseye using the CLI

sed -i "s/buster\/updates/bullseye-security/" /etc/apt/sources.list
sed -i "s/buster/bullseye/" /etc/apt/sources.list
apt update
apt upgrade
apt dist-upgrade

# Warings off
echo "APT::Get::Update::SourceListWarnings::NonFreeFirmware \"false\";" > /etc/apt/apt.conf.d/no-bookworm-firmware.conf