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<h1 id="wifi">Networking issues</h1>
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<h3 id="microsoft-surface-laptop">Microsoft Surface Laptop 3 and 4</h3>
 
<!--
Last updated: 2022-09-12
-->
 
The keyboard and mouse do not work on this laptop. If you find a workaround, please let us know.
 
<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.
 
<h1 id="wifi">Networking issues</h1>
<a id="sandisk"></a>
<h2 id="problematic-wifi">Problematic Wi-Fi interfaces</h2>
<a id="problematic-usb-sticks"></a>
Check in this section if there is a workaround to get your Wi-Fi interface work in Tails.
 
To know the model of your Wi-Fi interface:
 
Open a *Console* and execute the following command.
 
lspci -v | grep "Network controller"
 
<h3 id="88w8897">88W8897 [AVASTAR] 802.11ac Wireless</h3>
 
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Last updated: 2018-09-19
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On some computers with a Marvell Avastar 88W8897 Wi-Fi adapter, such as some Microsoft Surface Pro models, Tails fails to connect to Wi-Fi networks.
 
If you experience this problem, you can try to [[disable MAC address anonymization|doc/first_steps/welcome_screen/mac_spoofing]] that sometimes fixes it.
 
<h3 id="rtl8723be">RTL8723BE PCIe Wireless Network Adapter</h3>
 
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Last updated: 2017-12-24
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On some computers with a RTL8723be Wi-Fi adapter, Tails might fail to discover Wi-Fi networks, provide unreliable Wi-Fi connections, or have poor Wi-Fi performance.
 
You can try to [[add the following boot options when starting Tails|doc/advanced_topics/boot_options]] until you find a combination that works for you. The exact combination of options that works depends on the computer:
 
<span class="command">rtl8723be.fwlps=0 rtl8723be.ips=0</span>
 
<span class="command">rtl8723be.ant_sel=1</span>
 

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<h1 id="wifi">Networking issues</h1>
<a id="sandisk"></a>
02/27/2024
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String information

Source string description
type: Plain text
Flags
no-wrap
Unit identifier
680737
String age
02/27/2024
Last updated
04/07/2026
Source string age
02/27/2024
Translation file gettext PO file
wiki/src/support/known_issues.zh_TW.po, string 63