In my case problem was related with full disk.
When I logged to console with Ctrl+Alt+F1, checked disk usage:
 $ df -h

And it showed, that there is no space left.

When I deleted some files, I could again log in.


Thanks (Mantas Zimnickas)

-- 
gnome power manager prevented gdm login 
https://bugs.launchpad.net/bugs/441646
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