It’s pretty easy to add 2FA authentication to Ubuntu 22.04.2 LTS. This guide will use libpam-google-authenticator to require 2FA when logging in. Make sure you save your backup codes when setting it up.

Here’s how:

sudo apt update
sudo apt install libpam-google-authenticator
# Now, follow the prompts to set up your 2FA. You can respond `yes` to all prompts.
sudo nano /etc/pam.d/common-auth
# Add this to the end of the file: `auth required nullok`.
sudo nano /etc/ssh/sshd_config
# Change `KbdInteractiveAuthentication` to `yes`.
systemctl reload sshd

You’re done! Try logging in again. You’ll be prompted for your password and then your 2FA code.

Adapted from this guide and updated for Ubuntu 22.04.2 LTS.