Learn how to upgrade Proxmox VE from version 8 to 9 on Debian 13 Trixie with this complete step-by-step guide, including repository changes, upgrade commands, and post-install checks.

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A comprehensive walkthrough for upgrading Proxmox VE from version 8 to 9, which runs on Debian 13 Trixie. The process involves running pre-upgrade checks, updating the current system, switching repository definitions from Bookworm to Trixie, and performing a dist-upgrade. Key steps include backing up configurations, migrating VMs and containers if clustered, updating Ceph to Squid if used, and handling configuration file prompts during the upgrade. The guide emphasizes testing on non-production systems first and verifying the upgrade with built-in checklist tools.

How to Upgrade Proxmox VE 8 to 9 on Debian 13 Trixie (Step-by-Step Guide)