Could not calculate upgrade-Can't mark 'kubuntu-desktop' for upgrade

[The Oracle]

Binary package hint: update-manager

Adept initiated upgrade is unable to calculate due to the following error message in main.log.
2008-06-17 10:59:14,874 DEBUG Marking 'kubuntu-desktop' for upgrade
2008-06-17 10:59:17,115 DEBUG Can't mark 'kubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.)
2008-06-17 11:01:31,949 ERROR Dist-upgrade failed: 'Can't upgrade required meta-packages'

Apt.log information:
Investigating kubuntu-desktop
Package kubuntu-desktop has broken dep on kcontrol
  Considering kcontrol 10000 as a solution to kubuntu-desktop 10000
  Considering kcontrol 10000 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on kde-guidance
  Considering kde-guidance 10000 as a solution to kubuntu-desktop 10000
  Considering kde-guidance 10000 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on kde-style-qtcurve
  Considering kde-style-qtcurve -1 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on kde-systemsettings
  Considering kde-systemsettings 10000 as a solution to kubuntu-desktop 10000
  Considering kde-systemsettings 10000 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on kdm
  Considering kdm 10000 as a solution to kubuntu-desktop 10000
  Considering kdm 10000 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on kicker
  Considering kicker 10000 as a solution to kubuntu-desktop 10000
  Considering kicker 10000 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on konq-plugins
  Considering konq-plugins 10000 as a solution to kubuntu-desktop 10000
  Considering konq-plugins 10000 as a solution to kubuntu-desktop 10000
Package kubuntu-desktop has broken dep on language-selector-qt
  Considering language-selector-qt 10000 as a solution to kubuntu-desktop 10000
  Considering language-selector-qt 10000 as a solution to kubuntu-desktop 10000
Done
Log time: 2008-06-17 11:01:32.277406