When starting Tails, [[set up an administration password|doc/first_steps/welcome_screen/administration_password]].
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<p>The packages included in Tails are carefully tested for security. Installing additional packages might break the security built in Tails, so be . For example, installing OpenVPN might modify the firewall rules that Tails uses to force network traffic to go through Tor. So, be careful with what you install.</p>
<p>The packages included in Tails are carefully tested for security. Installing additional packages might break the security built in Tails. For example, installing OpenVPN might modify the firewall rules that Tails uses to force network traffic to go through Tor. So, be careful with what you install.</p>
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InstallingExamples of additional useful softwarepackages
CTo see which packages are installed automatically every time you start Tails, choose <span class="menuchoice"> <span class="guimenu">Applications</span> ▸ <span class="guisubmenu">System Tools</span> ▸ <span class="guimenuitem">Synaptic Package ManagerAdditional Software</span></span>.
To see which packages are installed automatically every time you start Tails, choose <span class="menuchoice"> <span class="guimenu">Applications</span> ▸ <span class="guisubmenu">System Tools</span> ▸ <span class="guimenuitem">Additional Software</span></span>.
<p>The packages included in Tails are carefully tested for security. Configuring additional APT repositories might break the security built in 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 in Tails and might install software that has not even been approved by Debian. Be even more careful with what you install.</p>
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Create an <span class="filename">apt-sources.list.d</span> folder in your pPersistent volumStorage:
Edit <span class="filename">As root, edit */live/persistence/TailsData_unlocked/persistence.conf</span>*, the configuration of the pPersistent volume, as root and add the <span class="filename">Storage, and add the *apt-sources.list.d</span>* folder as a persistencefeature of type `link`:
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`:
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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 101 (Busterllseye), 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 11 (Bullseye), 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:
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File names must end with <span class="filename">.list</span> *.list* and mayust only contain the following characters: letters, digits, underscore, hyphen, and period.