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Loading saved prints may lead to an error if they were stored long time ago and so they're using a wrong format. In such case we list the prints as available even though they are really not, so the PAM module won't return PAM_AUTHINFO_UNAVAIL as in the no-prints case but PAM_USER_UNKNOWN. This will lead some auth systems (such as gdm) to keep retrying using PAM fprintd module, even if it's not really available.