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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