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== PAM two-factor Yubikey One-Time Password authentication ==
'''Note:''' Make sure you have at least one user that is able to login without a Yubikey; if you are not able to connect to the Internet, you will not be able to use your Yubikey,
as it relies on the [https://developers.yubico.com/Software_Projects/YubiKey_OTP/YubiCloud_Validation_Servers/ Yubicloud] servers run by Yubico, without any unless you change the key configuration.
* Install [https://github.com/Yubico/yubico-pam pam_yubico] for your desired Linux distribution.