«`html

FATAL: The following signatures were invalid Error in Debian 11

If you’ve encountered the error FATAL: The following signatures were invalid while installing packages in Debian 11, don’t panic. Let’s break down what this error is and how to fix it.

Causes of the Error

This error usually arises due to issues with the package signing keys. Debian uses GPG (GNU Privacy Guard) to verify the authenticity and integrity of packages, and if the signing keys have been changed or corrupted, you’ll see this error message.

Solution to the Problem

There are several ways to fix this error. Here are a few of them:

• Update the list of GPG keys: sudo apt-key adv --refresh-keys
• Re-import the key with the problematic ID: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com KEY_ID
• Remove and re-add the repository keys: sudo rm -r /etc/apt/trusted.gpg.d then sudo apt-key update

Choose the method that suits your situation and execute the corresponding commands. After that, try installing the package again, and the error should disappear.

Conclusion

The error FATAL: The following signatures were invalid can be frustrating, but it’s not unfixable. By following our recommendations, you can fix it and continue working with your Debian 11 system without problems.

«`