<h2 id="sbat">Shim SBAT verification error</h2>

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.

<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>

If you get this error message when starting Tails, then do a [[manual upgrade|doc/upgrade#manual]] of your Tails USB to Tails 6.7 or later.

If you get this error message when starting your regular Linux operating system, then it means that your Linux operating system is outdated.

Edit your UEFI settings to disable Secure Boot.

With Secure Boot disabled, your regular Linux operating system should
start again.

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.

Update your regular Linux operating system.

Try to enable Secure Boot again in your UEFI settings.

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.

It might take several months for your Linux distribution to provide updates
before you can enable Secure Boot again.