Write your additional `sources.list` files in the <span class="filename">apt-sources.list.d</span> folder.For example, to addthe `non-free` sections of Debian 10 (Buster3 (Trixie), backports, and securityupdates, 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: