Browse locally with the <span class="application">*Synaptic Package Manager</span>*:

Browse locally with the *Synaptic Package Manager*:

When starting Tails, [[Sset up an administration password |doc/first_steps/welcome_screen/administration_password]] when you start Tails.

When starting Tails, [[set up an administration password|doc/first_steps/welcome_screen/administration_password]].

<p>The packages included in Tails are carefully tested for security.
Installing additional packages might break the security built into Tails, so be
careful with what you install. For
example, installing OpenVPN might modify the firewall rules that Tails uses to
force network traffic to go through Tor.</p>

<p>The packages included in Tails are carefully tested for security.
Installing additional packages might break the security built into Tails. For
example, installing OpenVPN might modify the firewall rules that Tails uses to
force network traffic to go through Tor.</p>

Choose <span class="menuchoice"> <span class="guimenu">Applications</span>&nbsp;▸ <span class="guisubmenu">To see which packages are installed automatically every time you start Tails, choose **Apps&nbsp;▸ System Tools</span>&nbsp;▸ <span class="guimenuitem">Synaptic Package Manager</span></span>Additional Software**.

To see which packages are installed automatically every time you start Tails, choose **Apps&nbsp;▸ System Tools&nbsp;▸ Additional Software**.

InstallUsing a*Additional sSoftware
*:

Using *Additional Software*:

<p>The packages included in Tails are carefully tested for security.
Configuring additional APT repositories might break the security built in to
Tails.
B and might install software that has not even been approved by Debian. Be even more careful
with what you install.</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>

Create an <span class="filename">*apt-sources.list.d</span>* folder in your pPersistent volumStorage:

Create an *apt-sources.list.d* folder in your Persistent Storage:

Write your additional `sources.list` files in the <span class="filename">apt-sources.list.d</span> folder. For example, to add
the `non-free` sections of Debian 10 (Buster3 (Trixie), backports, and security
updates, you can create a file named <span class="filename">
*/live/persistence/TailsData_unlocked/apt-sources.list.d/non-free.list</span>*
with the following content:

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: