Debian 13 upgrade script

debian13upgrade.sh

#!/bin/bash

# A sequence of scripts to safely upgrade from Debian 12 to Debian 13
# This is based of this guide https://linuxconfig.org/how-to-upgrade-debian-to-latest-version
# This script ONLY executes the commands, some commands require user input for confirmations

# EMERGENCY RECOVERY
# If the upgrade fails and your system becomes unbootable, use a Debian 13 live USB to access recovery tools and restore your system from backups or fix package conflicts.

# Run as root (by logging in as root)

# Use the flag --no-reboot to prevent the system from rebooting after completing the configuration

# Pre-Upgrade System Preparation
echo "Pre-Upgrade System Preparation"
sleep 1
tar -czf /backup/etc-backup-$(date +%Y%m%d).tar.gz /etc
dpkg --get-selections > /backup/package-selections-$(date +%Y%m%d).txt

apt update
apt upgrade -y
apt dist-upgrade -y

apt clean
apt autoremove -y

apt --fix-broken install
dpkg --configure -a

# Repository Configuration Update
echo ""
echo "Repository Configuration Update"
sleep 1
cp /etc/apt/sources.list /etc/apt/sources.list.bookworm-backup
cp -r /etc/apt/sources.list.d /etc/apt/sources.list.d.bookworm-backup

sed -i 's/bookworm/trixie/g' /etc/apt/sources.list
find /etc/apt/sources.list.d -name "*.list" -exec sed -i 's/bookworm/trixie/g' {} \;

apt update

# Debian 13 Upgrade Process
echo ""
echo "Debian 13 Upgrade Process"
sleep 1
apt upgrade --without-new-pkgs -y
apt full-upgrade -y

# Post-Upgrade Verification
echo ""
echo "Post-Upgrade Verification"
sleep 1
cat /etc/debian_version
cat /etc/os-release

apt autoremove -y
apt autoclean

apt update
apt list --upgradable

# --- Reboot handling ---
if [[ "$1" == "--no-reboot" ]]; then
    echo "No Reboot flag detected. Manual reboot is required."
else
    echo "Upgrade completed, rebooting..."
    sleep 3
    systemctl reboot
fi