Debian 13 (Trixie) Upgrade and Java AI Agent Development Guide

Debian 13, code‑named Trixie, became stable on 9 August 2025. It ships with Linux kernel 6.12 LTS, Python 3.13, GCC 14.2 and is supported until 2028 (LTS to 2030). The only supported path is an upgrade from Debian 12 (Bookworm); a clean downgrade is not available, so a full backup or VM snapshot is required before proceeding. The upgrade involves updating the current system, switching repository entries from “bookworm” to “trixie”, and performing a two‑stage upgrade—first a minimal update without new packages, then a full upgrade that brings in the new kernel and dependencies.

A companion guide shows how to use Debian 13 as a platform for building Java AI agents with Google’s Agent Development Kit (ADK). After confirming the OS version, users install development tools such as Java 25 via SDKMAN!, Maven 3.6.3+, and the Google Cloud CLI. The project compiles with Java 25, and the agent code is deployed to Google Cloud Run using the ADK Dev UI. The guide includes repository setup, package installation, and verification steps for both the Debian upgrade and the Java AI agent workflow.