Thanks for your bugreport.
The multiarch line is indeed the problem. What version of dpkg are you running
from what origin?
Could you please run:
$ apt-cache policy dpkg
and attach the output?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/873970
Title:
update from natty to oneric failed (amd64): E:Sub-process dpkg
returned an error code (2)
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