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Error WARNING: APT: The following signatures were invalid in Ubuntu 14.04
If you’ve encountered the error message “WARNING: APT: The following signatures were invalid” in Ubuntu 14.04, don’t worry, we have a guide to resolve this issue. In this article, we will discuss the causes of this error and how to fix it.
Causes of the error
- Incorrectly configured repository keys
- Incorrectly installed or invalid package signatures
- Problems accessing repository servers
How to fix the error «WARNING: APT: The following signatures were invalid»
To resolve the problem with invalid signatures in APT in Ubuntu 14.04, you need to follow these steps:
- Open the terminal (Ctrl+Alt+T)
- Update the APT package list using the command
sudo apt-get update - If you receive a «GPG error», execute the command
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys KEY, where KEY is the key code specified in the error message - Repeat the APT package list update using the command
sudo apt-get update - Update all installed packages with the command
sudo apt-get upgrade
After completing these steps, the error «WARNING: APT: The following signatures were invalid» should be fixed, and you can continue to use APT without problems.
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