PAM/Google-auth disabled
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I added
'auth required /usr/local/lib/pam_google_authenticator.so' (or something very similar) to /etc/pam.d/sshd
It was working.
After a while I came back and there was no 2nd factor. Could an update have removed the line?
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Those files will be overwritten by upgrades. Outside of that, nothing else should touch them. Should be easy to use the system patches package to patch that file.