Mark, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
nouveau/+bug/1354610/comments/3 regarding this being fixed with an
update. For future reference you can manage the status of your own bugs
by clicking on the current status
Update from kernel 3.13.0-32-generic to 3.13.0-34-generic and the boot
problem does not occur -- but, there is significant screen flicker at
2560x1440 screen resolution.
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Attached is the full log for an attempted ( failed ) boot from kern.log:
** Attachment added: bootlog.txt
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1354610/+attachment/4174095/+files/bootlog.txt
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