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I'm running Elementary Luna Beta 1 and I'm running into some pretty difficult problems. Whenever I try logging in with the greeter (either pantheon-greeter or even lightdm-gtk-greeter), it immediately returns me to the login screen after the screen goes black.

I'm not seeing anything significant in ~/.xsession-errors or in /var/log/Xorg.0.log. Where else should I look for potential problems? How can I debug what's going wrong with my session? If I log into a guest session, everything works fine, but I can't log into my own account.

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In this situation, the 1st thing to try is to create a new account and see if that crash the wm login also. – John Siu Dec 18 '12 at 1:33
Ok, created new user with useradd -m -s tester and set password with passwd tester and was able to log in without any problems. No crashes, I am able to get into the session just fine. – Naftuli Tzvi Kay Dec 18 '12 at 1:38

Base on feed back from comment and with minimum info in .xsession-errors. Do following

  1. Check /var/log/syslog

  2. Compare groups

    groups <username>
  3. Compare home directory permission

    ls -lh /home
    ls -lh /home/<username>
  4. Create new home directory and move stuff back one by one

    cd /home
    mv username username.old
    mkdir username
    chown username:username username

    Then try login from WM again. If that works, it is most likely some thing in those hidden directory stopping you from login, move those hidden directory from /home/username.old to /home/username one by one to pin point it.

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up vote 1 down vote accepted

Evidently, I had some NVIDIA configuration in my home folder as well as .Xauthority files. I moved those into a backup folder and I was able to get in. As suggested elsewhere online, I then double-checked all of my power connections inside of my computer case, as this is often why drive issues happen.

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