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On Ubuntu 10.10 when I run the command sphinx-build -b epub -d _build/doctrees . _build/epub, I see the following output:

Running Sphinx v0.6.6

Sphinx error: Builder name epub not registered make: * [epub] Error 1

It could just be a missing package, but I don't know which one. The sphinx documentation page doesn't say that the epub builder is only available in a later release.

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You could ask on the Sphinx mailing list. – Adam Byrtek Apr 8 '11 at 14:03
Have you enabled the epub support? It's disabled by default. – R.K. Jan 22 '12 at 15:07
up vote 1 down vote accepted

Sphinx 0.6.6 doesn't have epub support. It was added on version 1.0. You might want to check the changelog for more details.

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