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[[!wikipedia Secure Boot]] is a security measure that prevents starting malicious operating systems on a computer. Most computers running Windows have Secure Boot enabled. Linux distributions, including Tails, also support Secure Boot.
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Why is this happening?
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After this change in Tails occurs, the computer might display a **Secure Boot Violation** error or another error message when trying to start Tails.
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Otherwise, Tails will no longer start on this computer after a future Tails upgrade. We cannot predict when such an upgrade will occur, because the timing depends on changes that Tails could inherit from Debian in any Tails upgrade.
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[[!img support/known_issues/secure_boot_certificates/secure_boot_update_needed.png class="screenshot" alt="Notification: Secure Boot Update Needed"]]
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If the **Secure Boot Update Needed** notification below appears when starting Tails, it means that the Secure Boot certificates of this computer need to be updated.
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[[!toc startlevel=2]]
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[[!meta title="Secure Boot certificates update"]]
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