to prevent xserver-xorg-core upgrade after downgrading to ubuntu2 put a hold on 
package xserver-xorg-core : 
" sudo aptitude hold xserver-xorg-core " this will hold package to current 
installed version untill this bug is fixed ( SOON!? )

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Black Bar Across Screen with latest Xorg Update
https://bugs.launchpad.net/bugs/137604
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