Upgrade Ubuntu 12.04 to 12.10 failed

Posted by pre-commit-hook on Ask Ubuntu See other posts from Ask Ubuntu or by pre-commit-hook
Published on 2012-10-22T10:23:35Z Indexed on 2012/10/22 11:18 UTC
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12.04

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upgrade

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12.10

I've a problem. Upgrade failed after "Setting new software channels", when Calculating changes. I tried error:

Not all updates can be installed

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

If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

Now i have 1580 packages to update and do not update. Partial system upgrade also fails in the first step. What next? Alternatively, to undo the changes? Thank's to help.

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