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<p class="command">sudo chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
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<p class="command">sudo apt clean</p>
 
Configuring additional APT repositories (for advanced users)
 
<p>The packages available in Debian are
submitted to public scrutiny.</p>
 
<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>
<p>بسته‌های موجود در تیلز با دقت از نظر امنیتی بررسی شده‌اند.
نصب بسته‌های اضافی ممکن است امنیت موجود در تیلز را دچار مخاطره کند.
مراقب باشید که چه چیزی نصب می‌کنید.</p>
<p>This step is usually not needed to install additional software and might be necessary
only in very rare occasions.</p>
 
Sometimes, you might need to configure additional APT repositories. For example, to install packages from the `non-free` section of Debian. To do so:
 
Create an *apt-sources.list.d* folder in your Persistent Storage:
 
<p class="command">sudo install -d -m 755 /live/persistence/TailsData_unlocked/apt-sources.list.d</p>
 
As root, edit */live/persistence/TailsData_unlocked/persistence.conf*, the configuration of the Persistent Storage, and add the *apt-sources.list.d* folder as a feature of type `link`:
 
/etc/apt/sources.list.d source=apt-sources.list.d,link
/etc/apt/sources.list.d source=apt-sources.list.d,link
Write your additional `sources.list` files in the *apt-sources.list.d* folder.
 
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:
 
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
 
File names must end with *.list* and must only contain the following
characters: letters, digits, underscore, hyphen, and period.
 
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.
 
<p class="command">sudo chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list
chmod 644 /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list
<p class="command">sudo chmod 644 /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list
chmod 644 /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list
Restart Tails to apply the changes.
 

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<p class="command">sudo chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list
chmod 644 /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list
11/13/2025
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Source string description
type: Plain text
Flags
no-wrap
Unit identifier
757064
String age
11/13/2025
Last updated
11/13/2025
Source string age
11/13/2025
Translation file gettext PO file
wiki/src/doc/persistent_storage/additional_software.fa.po, string 126