I had the same problem, my file-system went corrupt and when i tried to
repair the system packages by shell (safe mode), the same error
happened.

I solved this problem with these comands:

  sudo rm /usr/share/perl5/Debconf/FrontEnd/Gnome.pm
  sudo aptitude reinstall debconf

then it shows you an ask box and choice dialog.

system de packages are working great now.

i hope this helps

-- 
package xserver-xorg 1:7.3+10ubuntu7 failed to install/upgrade because gnome 
debconf can not connect to the DISPLAY
https://bugs.launchpad.net/bugs/205096
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