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Add 2FA to SSH on Ubuntu—install with apt install libpam-google-authenticator run google-authenticator per user and edit /etc/pam d/sshd with auth required pam_google_authenticator so Update /etc/ssh/sshd_config with ChallengeResponseAuthentication yes restart with systemctl restart sshd Test login—expect a code prompt Boosts SSH security on DigitalOcean