How to fix the "Unable to calculate upgrade" issue when upgrading from 12.04 to 12.10?

Posted by Vagrant232 on Ask Ubuntu See other posts from Ask Ubuntu or by Vagrant232
Published on 2012-10-18T23:09:59Z Indexed on 2012/10/18 23:17 UTC
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upgrade

I've been trying to upgrade to 12.10 ever since it was released today but I keep meeting this error: "An unresolvable problem occurred while calculating the upgrade: E:Unable to correct problems, you have held broken 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"

I've tried updating all the currently installed software, removing all the extra PPAs, downgrading the files installed from xorg edgers' ppa but I haven't been able to solve the problem.

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