To know which packages are available in Debian:

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

Browse locally with the *Synaptic Package Manager*:

Browse the packages by sections from the left sidebar.

If you are unsure:

To install an additional package automatically when starting Tails:

After you installed many packages that you are not using anymore, you can free some space in your Persistent Storage:

Sometimes, you might need to configure additional APT repositories. For example, to install packages from the `non-free` section of Debian. To do so:

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.

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.