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[[Emailing and reading news with Thunderbird|doc/anonymous_internet/thunderbird]]
05/20/2026
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[*Thunderbird*](https://www.thunderbird.net/), an email client with support for OpenPGP and RSS and Atom news feeds
05/20/2026
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deb tor+http://ftp.us.debian.org/debian/ trixie non-free
deb tor+http://security.debian.org/ trixie-security non-free
deb tor+http://ftp.us.debian.org/debian/ trixie-updates non-free
deb tor+http://ftp.us.debian.org/debian/ trixie-backports non-free
11/25/2025
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<p class="command">sudo chmod 644 /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
11/13/2025
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<p class="command">sudo chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
11/13/2025
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Correct the ownership and permissions of your additional `sources.list` files to be owned by `root` and only readable by others. For example, execute the following commands.
11/13/2025
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<p class="command">sudo apt clean</p>
11/13/2025
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Execute the following command.
11/13/2025
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Choose **Apps&nbsp;▸ System Tools&nbsp;▸ Console**.
11/13/2025
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For example, to add
the `non-free` sections of Debian 13 (Trixie), backports, and security
updates, you can create a file named
*/live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list*
with the following content:
09/18/2025
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<p>Configuring additional APT repositories might break the security built into
Tails and might install software that has not even been approved by Debian. Be even more careful
with what you install.</p>
09/18/2025
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[[!img remove.png class="screenshot" alt=""]]
09/18/2025
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Choose **Apps&nbsp;▸ System Tools&nbsp;▸ Additional Software**.
09/18/2025
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**Install Every Time**, you can remove it either:
09/18/2025
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To see which packages are installed automatically every time you start Tails, choose **Apps&nbsp;▸ System Tools&nbsp;▸ Additional Software**.
09/18/2025
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<p class="command">torsocks mumble</p>
09/18/2025
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For example, to use *Mumble* in Tails, you can also execute the following
command:
09/18/2025
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<p class="command-template">torsocks <span class="command-placeholder">application</span></p>
09/18/2025
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Execute the following command in a *Console*. Replace
<span class="command-placeholder">application</span> with the command line
of the application that you want to open.
09/18/2025
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Open the application using `torsocks` on the command line.
09/18/2025

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