This is known bug. Read https://help.ubuntu.com/community/DapperUpgrades#head-0171d3953a2ea19e9b4228bcd5cde3ecfb67f7af
** Changed in: ubuntu-meta (Ubuntu)
Status: Unconfirmed => Rejected
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Updating from Breezy to Drake produces error unbuntu-desktop
https://launchpad.net/bugs/51132
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