Tails is a portable operating system that protects against surveillance and censorship.

How Tails works
https://tails.net/about/index.en.html

Documentation
https://tails.net/doc/index.en.html

Install Tails using Disks
https://tails.net/install/index.en.html
Install Tails from Debian or Ubuntu using the command line and GnuPG
https://tails.net/install/expert/index.en.html#install
sudo dd if=./tails-amd64-7.0.img of=/dev/sda bs=16M oflag=direct status=progress

Uniting for Internet Freedom: Tor Project & Tails Join Forces
https://blog.torproject.org/tor-tails-join-forces/