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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?

share|improve this question… – yuan Aug 1 '13 at 13:56


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...

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

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