Software Updates reports wrong last check time

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http://askubuntu.com – Every time after I run Software Updates, and have installed all the updates, the Software Updates Manager will show "The last check for updates was over a week ago. Please click Check for Updates to check." But the last update check was just minutes ago. How can I fix that? I checked the package history, and under Today there's all the updates I've installed minutes age. It seems normal. And the system date and time are correct. I am using Kubuntu Desktop 12.04 x86-64 btw. (HowTos)