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When I try to upgrade from 12.10 to 13.04 I get this error:

Checking for a new Ubuntu release
Traceback (most recent call last):
  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'

Can anyone help?

Thank you.

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closed as off topic by Jorge Castro, Eric Carvalho, Basharat Sialvi, bcbc, Seth Apr 28 '13 at 1:56

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here. If this question can be reworded to fit the rules in the help center, please edit the question.

What command are you using? –  Mitch Apr 27 '13 at 10:32
Welcome to Ask Ubuntu! This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  Jorge Castro Apr 27 '13 at 14:34