We use the testing ''Stretch'' release because Sugar is not in the current stable ''Jessie'' release, as it was not ready. But this has been fixed.
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We use the testing ''Stretch'' release because Sugar is not in the current stable ''Jessie'' release, as it was not ready; "due to critical issues with collaboration discovered during freeze of the distribution release process". But this has been fixed.
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To help avoid this happening again, test early and test often.