Thanks for your report.
From term.log
===
Unpacking replacement initscripts ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
dpkg: error processing dpkg (--configure):
package dpkg is already installed and configured
Errors were encountered while processing:
dpkg
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https://bugs.launchpad.net/bugs/927993
Title:
distibution upgrade from lucid to precise failed with a dpkg error
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And my screenlog
** Attachment added: screenlog.0
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/927993/+attachment/2720891/+files/screenlog.0
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