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It might take several months for your Linux distribution to provide updates
before you can enable Secure Boot again.
 
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If your regular Linux operating system still doesn't start, then disable
Secure Boot again. You can try to enable Secure Boot again in the future.
 
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Try to enable Secure Boot again in your UEFI settings.
 
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Update your regular Linux operating system.
 
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To learn how to edit the BIOS or UEFI settings, search for the user manual
of the computer on the support website of the manufacturer.
 
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With Secure Boot disabled, your regular Linux operating system should
start again.
 
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Edit your UEFI settings to disable Secure Boot.
 
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If you get this error message when starting your regular Linux operating system, then it means that your Linux operating system is outdated.
 
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<p class="code">
Verifying shim SBAT data failed: Security Policy Violation<br>
Something has gone seriously wrong: SBAT self-check failed: Security Policy Violation
</p>
 
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This section applies if you get the following error message, either when starting Tails or when restarting your regular Linux operating system after starting Tails.
 
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<h2 id="sbat">Shim SBAT verification error</h2>
 
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The keyboard and mouse do not work on this laptop. If you find a workaround, please let us know.
 
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<!--
Last updated: 2022-09-12
-->
 
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<h3 id="microsoft-surface-laptop">Microsoft Surface Laptop 3 and 4</h3>
 
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acpi_rev_override=1
 
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To start Tails successfully, try to [[add the following boot option when starting Tails|doc/advanced_topics/boot_options]]:
 
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<p class="code">soft lockup - CPU#<span class="command-placeholder">N</span> stuck for <span class="command-placeholder">N</span>s</p>
 
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On some laptops, Tails starts with the following error:
 
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<!--
Last updated: 2019-05-20
-->
 
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<h3 id="lockup">"Soft lockup" error</h3>
 
03/06/2025

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