Solved: What to do with this?

🚀 Executive Summary TL;DR: The ‘apt-key is deprecated’ warning indicates a shift from a globally trusted keyring to a more secure, per-repository key management system. To resolve this, PPA keys should be moved to the modern ‘signed-by’ method, ensuring CI/CD pipelines and server provisioning continue to function on modern Debian and Ubuntu systems. 🎯 Key Takeaways The ‘apt-key is deprecated’ warning signals a security enhancement, moving from a single global keyring ( /etc/apt/trusted.gpg ) to isolated, per-repository keys. The ‘Right Way’ to fix this involves creating a dedicated /etc/apt/keyrings/ directory for GPG keys and explicitly linking them to repository source files using the [signed-by=…] attribute. While a ‘Quick Fix’ involves piping dearmored keys to /etc/apt/trusted.gpg.d/ , it maintains a global trust model and is not recommended for long-term production use. A ‘Nuclear Option’ script can help migrate existing keys from trusted.gpg to individual files in trusted.gpg.d ,