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Tails could not determine whether an upgrade is available from our website. This is most likely caused by a network connection problem.
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Tails 無法決定是否可以從我們的網站取得升級器。
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To solve it:
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Read our [[release notes|doc/upgrade/release_notes]] to see if there are known issues with automatically upgrading to the latest version of Tails.
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If the problem persists, do a [[manual upgrade|doc/upgrade#manual]].
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<a id="4.18"></a>
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Automatic upgrades are broken between Tails 4.15 and Tails 4.18
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To upgrade from Tails 4.15, Tails 4.16, Tails 4.17, or Tails 4.18, you can either:
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- Do a [[manual upgrade|doc/upgrade#manual]].
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- Fix the automatic upgrade from a terminal. To do so:
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Start Tails and set up an [[administration password|doc/first_steps/welcome_screen/administration_password]].
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In a terminal, execute the following command:
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torsocks curl --silent https://tails.net/isrg-root-x1-cross-signed.pem \
| sudo tee --append /usr/local/etc/ssl/certs/tails.net-CA.pem \
&& systemctl --user restart tails-upgrade-frontend
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<div class="note">
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<p>This command is a single command that wraps across several lines.
Copy and paste the entire block at once and make sure that it executes
as a single command.</p>
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</div>
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Approximately 30 seconds later, you should be prompted to upgrade to the latest version of Tails. If no prompt appears, you might already be running the latest version of Tails.
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