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When I try to upgrade my 12.10 install to 13.04 via do-release-upgrade, I get the error:

File "/usr/bin/do-release-upgrade", line 145, in <module>
fetcher.run_options += ["--mode=%s" % options.mode,
AttributeError: type object 'DistUpgradeFetcherCore' has no attribute 'run_options'

When upgrading from GTK, the update-manager quits after informing about the new upgrade. This seems to be common as I've seen at least three threads on AskUbuntu about this error. Any help?

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prestonlee.com/2013/04/26/… –  yuan Aug 1 '13 at 13:56
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Source: http://ithelpblog.com/os/linux/debian/ubuntu-debian/attributeerror-type-object-distupgradefetchercore-has-no-attribute-run_options/

Seems running sudo apt-get upgrade && apt-get update solves the problem. I noticed that while the problem was happening on my system, none of Canonical's or any other repos were enabled. Must be something wrong with the package management system...

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Not working on my system. Ignore this... –  YatharthROCK May 13 '13 at 17:19
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