#!/bin/bash
# Script to upgrade Debian 11 to Debian 12
# Use with caution. Make sure you have a full backup before proceeding.
set -e # Stop the script in case of an error
echo "=== Starting Debian 11 to Debian 12 upgrade ==="
# Check the current version
echo "=== Checking the current version ==="
current_version=$(cat /etc/debian_version)
echo "Current version: $current_version"
if [[ "$current_version" != 11* ]]; then
echo "This script is designed for Debian 11 only. Exiting."
exit 1
fi
# Update the current system
echo "=== Updating the current system ==="
sudo apt update && sudo apt upgrade -y && sudo apt full-upgrade -y
echo "=== Cleaning up the system ==="
sudo apt autoremove --purge -y && sudo apt autoclean
# Backup the sources.list
echo "=== Backing up /etc/apt/sources.list ==="
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
# Modify the sources.list
echo "=== Modifying /etc/apt/sources.list ==="
sudo sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list
# Update the package list
echo "=== Updating the package list ==="
sudo apt update
# Simulate the upgrade
echo "=== Simulating the upgrade ==="
sudo apt upgrade --simulate
# Ask for confirmation before proceeding
read -p "Do you want to proceed with the upgrade? (yes/no): " confirmation
if [[ "$confirmation" != "yes" ]]; then
echo "Upgrade cancelled."
exit 0
fi
# Perform the full upgrade
echo "=== Performing the full upgrade to Debian 12 ==="
sudo apt upgrade -y && sudo apt full-upgrade -y
# Final cleanup
echo "=== Final cleanup ==="
sudo apt autoremove --purge -y
# Reboot the system
echo "=== Upgrade completed. Rebooting the system... ==="
sudo reboot
