Amuza sent me, by email, the logs of LightDM on his (her?) system. They include that line:
pam_ck_connector(lightdm-greeter:session): nox11 mode, ignoring PAM_TTY :0

A search on the Web suggest that only one user cannot login because, for some reason, ~/.Xauthority is unreadable. A solution would therefore be to log into a text session (Ctrl+Alt+F1 gives one) and remove ~/.Xauthority:
$ sudo rm ~/.Xauthority

@amuza: tell us if that solves your problem.

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