You have been subscribed to a public bug:
see also here http://ubuntuforums.org/showthread.php?t=1305459
for some reasons the upgrade brakes the graphic driver, xserver or so.
this means a flickering screen without the possibility to login or
startx.
** Affects: xorg (Ubuntu)
Importance: High
Status: New
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upgrade breaks graphic drivers and x, preventing login or startx
https://bugs.edge.launchpad.net/bugs/464591
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is subscribed to xorg in ubuntu.
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