Install Onionshare in Linux and use it to send files over Tor. This guide targets Ubuntu, Debian, Fedora, and Arch Linux. The developer of Onionshare officially supports Ubuntu with a PPA. Enable it on your system, and install Onionshare. Debian is in an unusual situation. Only the testing and unstable releases have updated versions of Onionshare in their repositories. Stable doesn't have it at all. So, if you're running testing or unstable, just install it. Otherwise, you're going to need to use Apt pinning.