same probleme here,
It seems like a running condition between lightdm and nvidia drivers.

sometimes it starts perfectly (less than 10s boot sequence)
sometimes I arrive in the "running in low graphics mode" windows.

workaround: switch to terminal, and just launch a 
$ sudo /etc/init.d/lightdm restart
and the login screen came back

may be a nvidia drivers related

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  lightdm improperly report low graphics card

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