Ubuntu 16.04 LTS (Xenial Xerus) Extended Security Maintenance (ESM) ended in April 2026, leaving systems without security updates. Users can upgrade through multiple stages (16.04 → 18.04 → 20.04 → 22.04 → 24.04) or pay for Canonical's Legacy add-on through Ubuntu Pro, which extends coverage until April 2031 for an additional fee. The Legacy ESM add-on is not included in standard Ubuntu Pro subscriptions and costs extra. Commands to check Pro status and enable legacy add-ons are provided.
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