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Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade:
E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the command 'ubuntu-bug update-manager' in a terminal.
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Hello and welcome. More information is needed before the community be able to help you. First and foremost, any of those possible causes applies to your case? –  carnendil Mar 8 '13 at 23:16
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The changes between 10.04 and 12.04 are big enough that I would personally recommend a clean install of 12.04 and then copy your data over having backed up first. I would not consider an upgrade. –  Warren Hill Mar 8 '13 at 23:59
    
You probably did all this, but did you do an sudo apt-get update, upgrade, and then install -f to ensure that all possible 10.04 updates have been applied and the dependencies are all fixed? –  Mordoc Mar 9 '13 at 2:10
    
Usually this is due to one or more PPAs - you should consider purgeing your PPA packages first before upgrading. Then you can reinstall your PPAs (if they exist for 12.04). Let us know what happens if you do this. –  fossfreedom Mar 9 '13 at 15:00
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