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Error WARNING: APT: The following signatures were invalid in Ubuntu 18.04


Error WARNING: APT: The following signatures were invalid in Ubuntu 18.04

If you’re using Ubuntu 18.04 and you’ve encountered the error «WARNING: APT: The following signatures were invalid», don’t panic. This error can be caused by incorrect package installation or problems with signature keys. In this article, we’ll explore how to fix this error and get your system back up and running.

Causes of the error

Signature errors can occur for various reasons, including:

  • Incorrect package installation
  • Problems with signature keys
  • System or package updates

How to fix the error

If you encounter the error «WARNING: APT: The following signatures were invalid», follow these steps to resolve it:

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  1. Open a terminal and run the following commands:

    2. sudo apt-get clean
    sudo apt-get update
    sudo apt-get upgrade

  2. Try updating the system again and check if the error has disappeared.
  3. If the error persists, try updating the package signature keys:

    4. sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys КЛЮЧ

  4. Repeat the system update and check if the error is resolved.
  5. If none of the above helps, try reinstalling the problematic packages again.

Conclusion

The error «WARNING: APT: The following signatures were invalid» can be annoying, but with the right steps, you can resolve it and return your system to normal operation.



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