libpam-yubicoは古くなってYubico OTPからU2Fに移行したほうが良いのかな?
Archived yubico-pam repository?https://www.reddit.com/r/yubikey/comments/1jkc0p7/archived_yubicopam_repository/
SSHの第2要素にTOTPかYubico OTPを利用するhttps://qiita.com/zunda/items/c61528397ca49ba797c6
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