While it might seem inconvenient at first, you should agree to this limitation for maximum protection. ![]() You’ll then be asked if you’d like to restrict the use of a token which forces you to wait for 30 seconds between login. The first question is a pretty safe one and you should allow the command to update your Google Authenticator file by answering yes. While it’s safe to answer yes to all of them, it’s a good idea to understand each one of them before making your final choice as these choices help balance security with ease-of-use. This will initiate the process of creating a secret key for the user by asking you a bunch of questions. Now in the terminal window, type: $ google-authenticator Once the package has been installed make sure you’re logged in as the user you want to protect with the two-factor authentication. To install the package on Ubuntu, head to the terminal and type: $ sudo apt-get install libpam-google-authenticator The Google Authenticator PAM module is available in the official Ubuntu’s software repositories. ![]() A PAM is a mechanism used to plug different forms of authentication into a Linux computer. ![]() To implement multi-factor authentication, you’ll need the Google Authenticator PAM (Pluggable Authentication Module). Google Authenticator will generate these OTPs on your Android device once it’s been configured for every user on your Ubuntu machine.
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