Software⏱️ 3 min read📅 2026-06-03

How to Fix: Trouble downloading packages list due to a "Hash sum mismatch" error

Hash sum mismatch error occurs when the downloaded package list has an incorrect hash sum, preventing further updates.

Quick Answer: Check the integrity of your package list by running "sudo apt update --fix-headers" to resolve the issue.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

When attempting to check for updates on your Ubuntu system, you may encounter an error message indicating a 'Hash sum mismatch' issue. This problem affects users who are trying to download package lists from official Ubuntu repositories.

This frustrating error can be caused by a variety of factors, including corrupted package files or incorrect repository settings. Fortunately, there are several methods to resolve this issue and get your system updated again.

🛑 Root Causes of the Error

  • The primary cause of the 'Hash sum mismatch' error is usually due to corrupted package files in the Ubuntu repository. This can happen when the repository files become outdated or damaged during transmission.
  • Another potential reason for this error is incorrect repository settings, such as using an invalid or non-existent repository URL.

🚀 How to Resolve This Issue

Update the package list and try again

  1. Step 1: Open a terminal on your Ubuntu system and run the following command: `sudo apt update`. This will update the package list and check for any new versions of packages.
  2. Step 2: If the error persists, try running the command `sudo apt full-upgrade` to upgrade all packages to their latest versions. This may resolve the 'Hash sum mismatch' issue.
  3. Step 3: After completing these steps, try checking for updates again using the Software Center or by running `sudo apt update` in the terminal.

Check repository settings and try again

  1. Step 1: Open the Software Sources settings by clicking on 'Software' in the Ubuntu menu and selecting 'Software Sources'.
  2. Step 2: In the 'Other Software' tab, ensure that the correct repository URL is selected. You can check the official Ubuntu documentation for the correct repository URLs.
  3. Step 3: If you are using a third-party repository, try removing it and adding it back to see if it resolves the issue.

💡 Conclusion

Resolving the 'Hash sum mismatch' error requires patience and persistence. By following these steps, you should be able to update your package list and get your system updated again. If you continue to encounter issues, consider seeking further assistance from a Linux expert or the Ubuntu community forums.

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