John the Ripper is a fast password cracker, currently available for many flavors
of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak
Unix passwords. Besides several crypt(3) password hash types most commonly found
on various Unix systems, supported out of the box are Windows LM hashes, plus lots
of other hashes and ciphers.
For versions of Ubuntu between 14.04 LTS (Trusty Tahr) and 15.10 (Wily Werewolf), as well as Ubuntu flavours that don’t include snap by default, snap can be installed from the Ubuntu Software Centre by searching for snapd.
Alternatively, snapd can be installed from the command line:
sudo apt update
sudo apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To install john-the-ripper, simply use the following command: