Found an error in Xorg.0.log:
-----------------------------------
[    28.605] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Dec 13 17:09:02 
2014
[    28.605] (==) Using config file: "/etc/X11/xorg.conf"
[    28.605] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    28.605] Data incomplete in file /etc/X11/xorg.conf
        Undefined Screen "nvidia" referenced by ServerLayout "layout".
[    28.605] (EE) Problem parsing the config file
[    28.605] (EE) Error parsing the config file
[    28.605] (EE)
Fatal server error:
[    28.605] (EE) no screens found(EE)
[    28.605] (EE)
-----------------------------------

The xorg.conf file contains:
-----------------------------------
Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0@0:2:0"
    Option "AccelMethod" "SNA"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection
-----------------------------------

The last 2 automatically saved xorg.conf files have the same content

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https://bugs.launchpad.net/bugs/1402149

Title:
  After update lightdm doesn't start

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