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We have seen "conversation with su failed" when doing sys admin tasks on our ubuntu builds (eg changing the time). We have seen this on some systems during QA.
Reboot and it goes away. Not the best solution - we are still looking for more info.
... --kylie, Thu, 26 Jun 2008 07:45:44 -0500 reply
Name: '#210 Failure to communicate with su' => '#210 Conversation with su failed '