Thanks for your bugreport.
This looks like there is something wrong with your virtualbox install.
To remove it, run:
$ sudo dpkg --remove --force-remove-reinstreq virtualbox
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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package management update error upon upgrade to 7.04
https://bugs.launchpad.net/bugs/152368
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Bugs, which is the bug contact for Ubuntu.
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ubuntu-bugs mailing list
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