PAM service may have changed or something? I didn't change anything, and
I have the same issue. I must start X manually.
Here is an extract from /var/log/auth.log:
Oct 1 13:10:58 complexe lightdm: pam_unix(lightdm-autologin:auth):
conversation failed
Oct 1 13:10:58 complexe lightdm: pam_unix(lightdm-autologin:auth): auth
could not identify password for [lightdm]
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