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type: Bullet: '1. '
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.
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English Chinese (Taiwan) (zh_TW) Actions
Execute the following command.
 
<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>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:
有時需要設定其它的 APT 資源庫，例如 Debian 底下的 `non-free` 區，為此請：
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>
sudo install -d -m 755 /live/persistence/TailsData_unlocked/apt-sources.list.d
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`:
以 root　身份修改 <span class="filename">/live/persistence/TailsData_unlocked/persistence.conf</span>　檔案來進行永久磁區的設定，並添加 *apt-sources.list.d*　資料夾為`link`類型旳持久功能：
/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:
在*apt-sources.list.d*資料來內寫入其它的`sources.list` 。例如要新增Debian Jessie`non-free` 部份的 backports, 和安全更新，可以新增一個檔名為*/live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list*檔案，其內容如下：
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
deb tor+http://ftp.us.debian.org/debian/ jessie non-free
deb tor+http://ftp.us.debian.org/debian/ jessie-backports non-free
deb tor+http://security.debian.org/ jessie/updates non-free
File names must end with *.list* and must only contain the following
characters: letters, digits, underscore, hyphen, and period.
檔案名必須以
*.list*為結尾，其可能包含下列
字符：字母、數字、下劃底線、連字符號和句點。
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.
把`sources.list` 檔案的所有者和許可權限改成由`root`所有，其它人僅可唯讀 ，例如：
<p class="command">sudo chown root:root /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
sudo install -d -m 755 /live/persistence/TailsData_unlocked/apt-sources.list.d
<p class="command">sudo chmod 644 /live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</p>
sudo install -d -m 755 /live/persistence/TailsData_unlocked/apt-sources.list.d
Restart Tails to apply the changes.
重啟 Tails 好進行變更。

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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.
把`sources.list` 檔案的所有者和許可權限改成由`root`所有，其它人僅可唯讀 ，例如：
11/13/2025
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English Chinese (Taiwan) (zh_TW)
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String information

Source string description
type: Bullet: '1. '
Unit identifier
757228
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.zh_TW.po, string 125