I believe this has to do with the Gnome 3 staging PPA that you have
enabled or have installed packages from.  You'll want to use the tool
ppa-purge to remove packages from this repository.  Then the release
upgrade should be possible.  Here's some of the packages you have
installed:

gnome-contacts 3.10.1-0ubuntu1~saucy1 1
gnome-control-center 1:3.10.1-0ubuntu1~saucy3 0
gnome-control-center-data 1:3.10.1-0ubuntu1~saucy3 1


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1385928

Title:
  The bug appears during the migration of Ubuntu from 14.04 to 14.10
  version

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