This is probably because the kubuntu-meta package is installed.

** Package changed: update-manager (Ubuntu) => ubuntu-release-upgrader
(Ubuntu)

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https://bugs.launchpad.net/bugs/1174533

Title:
  Update Manager shows Kubuntu 13.04 available, but the system is
  actually pure Ubuntu running KDE | [zh_TW]更新管理員在純種 Ubuntu ,跑 KDE
  的系統上顯示有 Kubuntu 13.04 可以升級(?)

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