Please try manually installing the package kubuntu-desktop on your 14.04
and then try the upgrade.  Thanks!

2015-05-15 17:27:14,258 DEBUG plugins for condition 
'from_utopicPostDistUpgradeCache' are '[]'
2015-05-15 17:27:14,258 DEBUG none of the '['ubuntu-desktop', 
'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop', 
'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-core', 'lubuntu-desktop', 
'ubuntu-gnome-desktop']' meta-pkgs installed
2015-05-15 17:27:14,258 DEBUG guessing 'kubuntu-desktop' as missing meta-pkg
2015-05-15 17:27:14,558 ERROR failed to mark 'kubuntu-desktop' for install 
(E:Unable to correct problems, you have held broken packages.)

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

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https://bugs.launchpad.net/bugs/1455548

Title:
  upgrade 14.10 to 15.04 can't install kubuntu-desktop

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