Without further details it is difficult to come to a conclusion. That
said, failing hardware could cause /etc/shadow to be unreadable or
contain garbage. Failing memory could cause the password hashing to
fail.
Perhaps some application has modified the pam settings in /etc/pam.d/ to
require different authentication methods.
But without further details it's all just guessing.
** Information type changed from Private Security to Public Security
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1091713
Title:
login password resets on it's own
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