The cause of the failure is
=====
Setting up xserver-xorg (1:7.3+10ubuntu10.2) ...
No protocol specified
Gtk-WARNING **: cannot open display: :0.0 at
/usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 60.
dpkg: error processing xserver-xorg (--configure):
subprocess post-installation script returned error exit status 1
=====
affecting to xorg.
You've reported the bug a while ago, is it still an issue ?
** Changed in: xorg (Ubuntu)
Sourcepackagename: update-manager => xorg
Status: New => Incomplete
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package update-manager 1:0.87.27 failed to install/upgrade: ErrorMessage:
SystemError in cache.commit(): E:Sub-process
/tmp/tmppj5iZD/backports/usr/bin/dpkg returned an error code (1)
https://bugs.launchpad.net/bugs/256455
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