The rapid development cycle of Ubuntu would be too fast for Tails.
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Ubuntu adds features in ways that we find dangerous for privacy. For anexampleUbuntu One ([partly discontinued](http://blog.canonical.com/2014/04/02/shutting-down-ubuntu-one-file-services/))and the [, see [EFF: Privacy in Ubuntu 12.10,Amazon aAds and dData lLeaks](https://www.eff.org/deeplinks/2012/10/privacy-ubuntu-1210-amazon-ads-and-data-leaks).
Ubuntu adds features in ways that we find dangerous for privacy. For an example, see [EFF: Privacy in Ubuntu 12.10, Amazon Ads and Data Leaks](https://www.eff.org/deeplinks/2012/10/privacy-ubuntu-1210-amazon-ads-and-data-leaks).