How do I fix: 🛑 Root Causes of the Error?

The primary reason for this error is that the Debian package source has an expired GPG key. When a package source's GPG key expires, it becomes invalid and cannot be verified by apt-get.Another possible reason for this error is that the system's clock may be out of sync or the GPG key server may not

How do I fix: 🚀 How to Resolve This Issue Updating the GPG Key?

Step 1: Update the system's clock to ensure it is accurate and synchronized with the current time.Step 2: Remove any existing GPG keys for the package source by running `sudo apt-key update` followed by `sudo apt-key list`. This will remove any expired or invalid keys from the system.Step 3: Import

How do I fix: Using a Different GPG Key Server?

Step 1: Try using a different GPG key server by running `sudo apt-key update` followed by `sudo apt-get update`. This may allow you to retrieve the valid GPG key for the package source.Step 2: If using a different GPG key server does not work, you can try importing the new GPG key manually using the

Software⏱️ 3 min read📅 2026-06-19

How to Fix: How to fix apt-get missing key error after adding deb source for package?

apt-get missing key error after adding deb source for package

Quick Answer: Try updating the keyserver with `sudo apt-key adv --keyserver hkp://pool.sks-keyservers.net --recv-keys D54CC349F42D5F07` and then run `sudo apt update` again.

📋 Table of Contents

🛑 Root Causes of the Error
🚀 How to Resolve This Issue
✨ Wrapping Up

The 'apt-get missing key error' is an issue that affects users who have added a Debian package source, but are unable to update their package lists due to a GPG key verification problem. This error occurs when the system cannot verify the authenticity of the package's GPG key.

This error can be frustrating for users as it prevents them from installing or updating packages, and may cause issues with software dependencies.

🛑 Root Causes of the Error

The primary reason for this error is that the Debian package source has an expired GPG key. When a package source's GPG key expires, it becomes invalid and cannot be verified by apt-get.
Another possible reason for this error is that the system's clock may be out of sync or the GPG key server may not be available.

🚀 How to Resolve This Issue

Updating the GPG Key

Step 1: Update the system's clock to ensure it is accurate and synchronized with the current time.
Step 2: Remove any existing GPG keys for the package source by running `sudo apt-key update` followed by `sudo apt-key list`. This will remove any expired or invalid keys from the system.
Step 3: Import the new GPG key for the package source using `sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys `, replacing `` with the actual ID of the new key.

Using a Different GPG Key Server

Step 1: Try using a different GPG key server by running `sudo apt-key update` followed by `sudo apt-get update`. This may allow you to retrieve the valid GPG key for the package source.
Step 2: If using a different GPG key server does not work, you can try importing the new GPG key manually using the `apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ` command.

✨ Wrapping Up

To resolve the 'apt-get missing key error', first update the system's clock and remove any existing expired or invalid GPG keys for the package source. If this does not work, try using a different GPG key server to retrieve the valid key for the package source.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid