[issue21215] build-deps instructions for Ubuntu

[Glenn Jones]

Glenn Jones added the comment:

On Ubuntu 13.10, using python3 did not install the dependencies (apt reported using the python3-defaults source package instead of python3). The python3.4, package does not exist, but the python3.3 package did work.

This may be that we're specifying the wrong package or that the upstream Ubuntu package has a bug or maybe we just need to use the specific package depending on what's available in the ubuntu version.

barry, what do you think?

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<http://bugs.python.org/issue21215>
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