You've customized your system in a way that is preventing the release
upgrade from proceeding.  In VarLogDistupgradeMainlog.txt we can see the
following:

2013-12-15 06:43:05,761 DEBUG none of the '['ubuntu-desktop', 
'kubuntu-desktop', 'xubuntu-desktop', 'ubuntustudio-desktop', 
'ichthux-desktop', 'mythbuntu-desktop', 'ubuntu-netbook', 'kubuntu-netbook', 
'lubuntu-desktop']' meta-pkgs installed
2013-12-15 06:43:05,762 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2013-12-15 06:43:06,728 ERROR failed to mark 'ubuntu-desktop' for install 
(E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by 
held packages.)

For the upgrade to proceed you'll need to install one of those meta-
pkgs.

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

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https://bugs.launchpad.net/bugs/1261062

Title:
  ubuntu-bug ubuntu-release-upgrader-core

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