<p>If you receive the error message <em>Device was not created using a USB image or Tails installer</em>, then you need to reinstall Tails either by:</p>
<ul> <li>Installing using our [[USB image|install/download]] instead of our ISO image</li> <li>[[Installing from another Tails|install/clone]]</li> </ul>
<p>If you receive the error message while running Tails using <i>virt-manager</i>, then you need to [[run Tails from our USB image|doc/advanced_topics/virtualization/virt-manager#usb_image]] instead of our ISO image.</p>
<p>To change the configuration of your Persistent Storage, restart Tails, unlock the Persistent Storage, and choose <strong>Applications</strong> ▸ <strong>Tails</strong> ▸ <strong>Configure persistent volume</strong> again.</p>
<p>We are often asked to implement new features of the Persistent Storage: Tor Browser preferences, Tor configuration, desktop background, mouse and touchpad settings, etc. See the
<p>The packages included in Tails are carefully tested for security. Installing additional packages might break the security built in Tails, so [[be careful with what you install|additional_software#warning]].</p>
<p>Since Tails 4.13 (November 2020), <em>Thunderbird</em> uses its own OpenPGP keyring, different from the keyring used by <em>GnuPG</em> and <em>Kleopatra</em>. You don't need to enable the GnuPG feature anymore if you only use OpenPGP encryption in <em>Thunderbird</em>.</p>
All the files in subfolders of */live/persistence/TailsData_unlocked/dotfiles* are also linked in the corresponding subfolder of the *Home* folder using Linux symbolic links.
A shortcut is provided in the left pane of the *Files* browser and in the **Places** menu in the top navigation bar to access the */live/persistence/TailsData_unlocked/dotfiles* folder.