Comment 8 for bug 157610

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Peter Clifton (pcjc2) wrote : Re: display freezes just before Ubuntu login window; shows nothing but vertical bars

Can you post the config file from /etc/X11/xorg.conf please. At least one comment in the Xorg.0.log file:

(WW) intel(0): Option "UseFBDev" is not used

Suggests that you have an old configuration file from a previous install we might want to take a look at.