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I believe I have corrupted all of my keyrings while trying to add keyrings for extra repositories. I foolishly moved some keyring files around in a console, and now my system is in a state such that apt-get and Ubuntu Software Center don't work any more. Ubuntu Software Center displays the following error message when trying to update packages:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

Please report this bug against the 'update-manager' package and include the following error message: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

Is there something I can do to repair my keyrings? Alternatively, if I absolutely have to just reinstall everything, is there an easy way to do this?

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i dont know if i understand that right or no,but upon what i understand that while you was importing new ppa or repos you mess up with your old that link may be solve your problem

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Why would I want the Launchpad keys? – David Rivers Mar 2 '12 at 0:02
i was trying to help man as i said before "i dont know if i understand that right or no,but upon what i understand" – Fathy Mar 2 '12 at 3:55
While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – stephenmyall Aug 21 '12 at 8:31

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